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  • Tadpole of American bullfrog, Rana catesbeiana.  A week after hatching, the tadpole is about 8mm long and has developed the familiar head-and-tail shape.  The skin is semi-transparent.
    05150195-bullfrog-tadpole.jpg
  • Tadpole of American bullfrog, Rana catesbeiana.  Ten days after hatching, the tadpole is about 8mm long. The skin is semi-transparent.
    05150211-bullfrog-tadpole.jpg
  • Tadpole of American bullfrog, Rana catesbeiana.  A week after hatching, the tadpole is about 8mm long and has developed the familiar head-and-tail shape. The skin is semi-transparent, and internal organs are visible.
    05150193-bullfrog-tadpole.jpg
  • Tadpole of American bullfrog, Rana catesbeiana.  Immediately after hatching, the tadpole is about 5mm long and still has the appearance of an embryo.
    05150112-bullfrog-tadpole.jpg
  • Tadpole of American bullfrog, Rana catesbeiana.  A week after hatching, the tadpole is about 8mm long and has developed the familiar head-and-tail shape.  The skin is semi-transparent.
    05150173-bullfrog-tadpole.jpg
  • Tadpole of American bullfrog, Rana catesbeiana.  Ten days after hatching, the tadpole is about 8mm long. The skin is semi-transparent.
    05150200-bullfrog-tadpole.jpg
  • Tadpole of American bullfrog, Rana catesbeiana.  Immediately after hatching, the tadpole is about 5mm long and still has the appearance of an embryo.
    05150098-bullfrog-tadpole.jpg
  • Tadpole of American bullfrog, Rana catesbeiana.  Immediately after hatching, the tadpole is about 5mm long and still has the appearance of an embryo.
    05150119-bullfrog-tadpole.jpg
  • Tadpole of American bullfrog, Rana catesbeiana.  A week after hatching, the tadpole is about 8mm long and has developed the familiar head-and-tail shape.  The skin is semi-transparent.
    05150148-bullfrog-tadpole.jpg
  • Tadpole of American bullfrog, Rana catesbeiana.  A week after hatching, the tadpole is about 8mm long and has developed the familiar head-and-tail shape.  The skin is semi-transparent.
    05150143-bullfrog-tadpole.jpg
  • Tadpole of California red-legged frog, Rana aurora draytonii.  Contra Costa County, California. Complete life cycle available, including eggs, tadpoles, metamorphs, froglets, and adults. Red-legged frogs were once abundant throughout California, and were the inspiration for Mark Twain's classic The Celebrated Jumping Frog of Calaveras County. Now, after more than a century of habitat destruction, water pollution, suburban sprawl, and predation by non-native bullfrogs, they've been reduced to a number of scattered, unconnected populations. Federally listed as a Threatened Species.
    06070010-red-legged-frog-tadpole.jpg
  • Tadpole of black-spined toad, Duttaphrynus melanostictus, with four legs.  Dili District, Timor-Leste (East Timor).
    10040648-tadpole.jpg
  • Tadpole of black-spined toad, Duttaphrynus melanostictus, with hind legs.  Dili District, Timor-Leste (East Timor).
    10040641-tadpole.jpg
  • Tadpole of California red-legged frog, Rana aurora draytonii.  Contra Costa County, California. Complete life cycle available, including eggs, tadpoles, metamorphs, froglets, and adults. Red-legged frogs were once abundant throughout California, and were the inspiration for Mark Twain's classic The Celebrated Jumping Frog of Calaveras County. Now, after more than a century of habitat destruction, water pollution, suburban sprawl, and predation by non-native bullfrogs, they've been reduced to a number of scattered, unconnected populations. Federally listed as a Threatened Species.
    06070008-red-legged-frog-tadpole.jpg
  • Tadpole of California red-legged frog, Rana aurora draytonii, in duckweed, Lemna sp. Contra Costa County, California. Complete life cycle available, including eggs, tadpoles, metamorphs, froglets, and adults. Red-legged frogs were once abundant throughout California, and were the inspiration for Mark Twain's classic The Celebrated Jumping Frog of Calaveras County. Now, after more than a century of habitat destruction, water pollution, suburban sprawl, and predation by non-native bullfrogs, they've been reduced to a number of scattered, unconnected populations. Federally listed as a Threatened Species.
    06100159-red-legged-frog-tadpole.jpg
  • Tadpole of California red-legged frog, Rana aurora draytonii, in duckweed, Lemna sp. Contra Costa County, California. Complete life cycle available, including eggs, tadpoles, metamorphs, froglets, and adults. Red-legged frogs were once abundant throughout California, and were the inspiration for Mark Twain's classic The Celebrated Jumping Frog of Calaveras County. Now, after more than a century of habitat destruction, water pollution, suburban sprawl, and predation by non-native bullfrogs, they've been reduced to a number of scattered, unconnected populations. Federally listed as a Threatened Species.
    06100087-red-legged-frog-tadpole.jpg
  • Tadpole of California red-legged frog, Rana aurora draytonii, Contra Costa County, California. Complete life cycle available, including eggs, tadpoles, metamorphs, froglets, and adults. Red-legged frogs were once abundant throughout California, and were the inspiration for Mark Twain's classic The Celebrated Jumping Frog of Calaveras County. Now, after more than a century of habitat destruction, water pollution, suburban sprawl, and predation by non-native bullfrogs, they've been reduced to a number of scattered, unconnected populations. Federally listed as a Threatened Species.
    06100064-red-legged-frog-tadpole.jpg
  • Tadpole of California red-legged frog, Rana aurora draytonii, Contra Costa County, California. Complete life cycle available, including eggs, tadpoles, metamorphs, froglets, and adults. Red-legged frogs were once abundant throughout California, and were the inspiration for Mark Twain's classic The Celebrated Jumping Frog of Calaveras County. Now, after more than a century of habitat destruction, water pollution, suburban sprawl, and predation by non-native bullfrogs, they've been reduced to a number of scattered, unconnected populations. Federally listed as a Threatened Species.
    06100057-red-legged-frog-tadpole.jpg
  • Tadpole of California red-legged frog, Rana aurora draytonii, in duckweed, Lemna sp. Contra Costa County, California. Complete life cycle available, including eggs, tadpoles, metamorphs, froglets, and adults. Red-legged frogs were once abundant throughout California, and were the inspiration for Mark Twain's classic The Celebrated Jumping Frog of Calaveras County. Now, after more than a century of habitat destruction, water pollution, suburban sprawl, and predation by non-native bullfrogs, they've been reduced to a number of scattered, unconnected populations. Federally listed as a Threatened Species.
    06100145-red-legged-frog-tadpole.jpg
  • Tadpole of California red-legged frog, Rana aurora draytonii, in duckweed, Lemna sp. Contra Costa County, California. Complete life cycle available, including eggs, tadpoles, metamorphs, froglets, and adults. Red-legged frogs were once abundant throughout California, and were the inspiration for Mark Twain's classic The Celebrated Jumping Frog of Calaveras County. Now, after more than a century of habitat destruction, water pollution, suburban sprawl, and predation by non-native bullfrogs, they've been reduced to a number of scattered, unconnected populations. Federally listed as a Threatened Species.
    06100080-red-legged-frog-tadpole.jpg
  • Tadpole of California red-legged frog, Rana aurora draytonii, in duckweed, Lemna sp. Contra Costa County, California. Complete life cycle available, including eggs, tadpoles, metamorphs, froglets, and adults. Red-legged frogs were once abundant throughout California, and were the inspiration for Mark Twain's classic The Celebrated Jumping Frog of Calaveras County. Now, after more than a century of habitat destruction, water pollution, suburban sprawl, and predation by non-native bullfrogs, they've been reduced to a number of scattered, unconnected populations. Federally listed as a Threatened Species.
    06100141-red-legged-frog-tadpole.jpg
  • Tadpole of California red-legged frog, Rana aurora draytonii, in duckweed, Lemna sp. Contra Costa County, California. Complete life cycle available, including eggs, tadpoles, metamorphs, froglets, and adults. Red-legged frogs were once abundant throughout California, and were the inspiration for Mark Twain's classic The Celebrated Jumping Frog of Calaveras County. Now, after more than a century of habitat destruction, water pollution, suburban sprawl, and predation by non-native bullfrogs, they've been reduced to a number of scattered, unconnected populations. Federally listed as a Threatened Species.
    06100134-red-legged-frog-tadpole.jpg
  • Tadpole of California red-legged frog, Rana aurora draytonii, in duckweed, Lemna sp. Contra Costa County, California. Complete life cycle available, including eggs, tadpoles, metamorphs, froglets, and adults. Red-legged frogs were once abundant throughout California, and were the inspiration for Mark Twain's classic The Celebrated Jumping Frog of Calaveras County. Now, after more than a century of habitat destruction, water pollution, suburban sprawl, and predation by non-native bullfrogs, they've been reduced to a number of scattered, unconnected populations. Federally listed as a Threatened Species.
    06100102-red-legged-frog-tadpole.jpg
  • Tadpole of California red-legged frog, Rana aurora draytonii, in duckweed, Lemna sp. Contra Costa County, California. Complete life cycle available, including eggs, tadpoles, metamorphs, froglets, and adults. Red-legged frogs were once abundant throughout California, and were the inspiration for Mark Twain's classic The Celebrated Jumping Frog of Calaveras County. Now, after more than a century of habitat destruction, water pollution, suburban sprawl, and predation by non-native bullfrogs, they've been reduced to a number of scattered, unconnected populations. Federally listed as a Threatened Species.
    06100082-red-legged-frog-tadpole.jpg
  • Tadpole of American bullfrog, Rana catesbeiana, Northern California. Native to the Eastern United States, bullfrogs were introduced and have become established west of the Rockies. Bullfrogs are large, aggressive predators and prolific breeders, and have seriously depleted native frog populations in many areas of the West.
    06070020-bullfrog-tadpole.jpg
  • Tadpole of California red-legged frog, Rana aurora draytonii, in duckweed, Lemna sp. Contra Costa County, California. Complete life cycle available, including eggs, tadpoles, metamorphs, froglets, and adults. Red-legged frogs were once abundant throughout California, and were the inspiration for Mark Twain's classic The Celebrated Jumping Frog of Calaveras County. Now, after more than a century of habitat destruction, water pollution, suburban sprawl, and predation by non-native bullfrogs, they've been reduced to a number of scattered, unconnected populations. Federally listed as a Threatened Species.
    06100097-red-legged-frog-tadpole.jpg
  • Tadpole of American bullfrog, Rana catesbeiana, with hind legs beginning to develop. Native to the Eastern United States, bullfrogs were introduced and have become established west of the Rockies. Bullfrogs are large, aggressive predators and prolific breeders, and have seriously depleted native frog populations in many areas of the West.
    06140303-bullfrog-tadpole.jpg
  • Tadpole of American bullfrog, Rana catesbeiana, Northern California. Native to the Eastern United States, bullfrogs were introduced and have become established west of the Rockies. Bullfrogs are large, aggressive predators and prolific breeders, and have seriously depleted native frog populations in many areas of the West.
    06100037-bullfrog-tadpole.jpg
  • Tadpole of American bullfrog, Rana catesbeiana, Northern California. Native to the Eastern United States, bullfrogs were introduced and have become established west of the Rockies. Bullfrogs are large, aggressive predators and prolific breeders, and have seriously depleted native frog populations in many areas of the West.
    06100010-bullfrog-tadpole.jpg
  • Tadpole of American bullfrog, Rana catesbeiana, Northern California. Native to the Eastern United States, bullfrogs were introduced and have become established west of the Rockies. Bullfrogs are large, aggressive predators and prolific breeders, and have seriously depleted native frog populations in many areas of the West.
    06010095-bullfrog-tadpole.jpg
  • Tadpole of American bullfrog, Rana catesbeiana, with hind legs beginning to develop. Native to the Eastern United States, bullfrogs were introduced and have become established west of the Rockies. Bullfrogs are large, aggressive predators and prolific breeders, and have seriously depleted native frog populations in many areas of the West.
    06140299-bullfrog-tadpole.jpg
  • Tadpole of American bullfrog, Rana catesbeiana, Northern California. Native to the Eastern United States, bullfrogs were introduced and have become established west of the Rockies. Bullfrogs are large, aggressive predators and prolific breeders, and have seriously depleted native frog populations in many areas of the West.
    06010108-bullfrog-tadpole.jpg
  • Tadpole of American bullfrog, Rana catesbeiana, with hind legs beginning to develop. Native to the Eastern United States, bullfrogs were introduced and have become established west of the Rockies. Bullfrogs are large, aggressive predators and prolific breeders, and have seriously depleted native frog populations in many areas of the West.
    06140305-bullfrog-tadpole.jpg
  • Tadpole of American bullfrog, Rana catesbeiana, Northern California. Native to the Eastern United States, bullfrogs were introduced and have become established west of the Rockies. Bullfrogs are large, aggressive predators and prolific breeders, and have seriously depleted native frog populations in many areas of the West.
    06100023-bullfrog-tadpole.jpg
  • Tadpole of American bullfrog, Rana catesbeiana, Northern California. Native to the Eastern United States, bullfrogs were introduced and have become established west of the Rockies. Bullfrogs are large, aggressive predators and prolific breeders, and have seriously depleted native frog populations in many areas of the West.
    06010097-bullfrog-tadpole.jpg
  • Tadpole of American bullfrog, Rana catesbeiana, with hind legs beginning to develop. Native to the Eastern United States, bullfrogs were introduced and have become established west of the Rockies. Bullfrogs are large, aggressive predators and prolific breeders, and have seriously depleted native frog populations in many areas of the West.
    06140307-bullfrog-tadpole.jpg
  • Tadpole of American bullfrog, Rana catesbeiana, Northern California. Native to the Eastern United States, bullfrogs were introduced and have become established west of the Rockies. Bullfrogs are large, aggressive predators and prolific breeders, and have seriously depleted native frog populations in many areas of the West.
    06010164-bullfrog-tadpole.jpg
  • Tadpole of American bullfrog, Rana catesbeiana, Northern California. Native to the Eastern United States, bullfrogs were introduced and have become established west of the Rockies. Bullfrogs are large, aggressive predators and prolific breeders, and have seriously depleted native frog populations in many areas of the West.
    06010086-bullfrog-tadpole.jpg
  • Tadpole of American bullfrog, Rana catesbeiana, Northern California. Native to the Eastern United States, bullfrogs were introduced and have become established west of the Rockies. Bullfrogs are large, aggressive predators and prolific breeders, and have seriously depleted native frog populations in many areas of the West.
    06100043-bullfrog-tadpole.jpg
  • Tadpole of American bullfrog, Rana catesbeiana, Northern California. Native to the Eastern United States, bullfrogs were introduced and have become established west of the Rockies. Bullfrogs are large, aggressive predators and prolific breeders, and have seriously depleted native frog populations in many areas of the West.
    06100029-bullfrog-tadpole.jpg
  • Tadpole of American bullfrog, Rana catesbeiana, Northern California. Native to the Eastern United States, bullfrogs were introduced and have become established west of the Rockies. Bullfrogs are large, aggressive predators and prolific breeders, and have seriously depleted native frog populations in many areas of the West.
    06070017-bullfrog-tadpole.jpg
  • Tadpole of American bullfrog, Rana catesbeiana, Northern California. Native to the Eastern United States, bullfrogs were introduced and have become established west of the Rockies. Bullfrogs are large, aggressive predators and prolific breeders, and have seriously depleted native frog populations in many areas of the West.
    06010158-bullfrog-tadpole.jpg
  • Tadpole of American bullfrog, Rana catesbeiana, with hind legs beginning to develop. Native to the Eastern United States, bullfrogs were introduced and have become established west of the Rockies. Bullfrogs are large, aggressive predators and prolific breeders, and have seriously depleted native frog populations in many areas of the West.
    06140308-bullfrog-tadpole.jpg
  • Tadpole of American bullfrog, Rana catesbeiana, Northern California. Native to the Eastern United States, bullfrogs were introduced and have become established west of the Rockies. Bullfrogs are large, aggressive predators and prolific breeders, and have seriously depleted native frog populations in many areas of the West.
    06100019-bullfrog-tadpole.jpg
  • Tadpole of American bullfrog, Rana catesbeiana, Northern California. Native to the Eastern United States, bullfrogs were introduced and have become established west of the Rockies. Bullfrogs are large, aggressive predators and prolific breeders, and have seriously depleted native frog populations in many areas of the West.
    06070014-bullfrog-tadpole.jpg
  • Tadpole of American bullfrog, Rana catesbeiana, Northern California. Native to the Eastern United States, bullfrogs were introduced and have become established west of the Rockies. Bullfrogs are large, aggressive predators and prolific breeders, and have seriously depleted native frog populations in many areas of the West.
    06070011-bullfrog-tadpole.jpg
  • Tadpole of American bullfrog, Rana catesbeiana, Northern California. Native to the Eastern United States, bullfrogs were introduced and have become established west of the Rockies. Bullfrogs are large, aggressive predators and prolific breeders, and have seriously depleted native frog populations in many areas of the West.
    06010096-bullfrog-tadpole.jpg
  • Tadpole of American bullfrog, Rana catesbeiana, Northern California. Native to the Eastern United States, bullfrogs were introduced and have become established west of the Rockies. Bullfrogs are large, aggressive predators and prolific breeders, and have seriously depleted native frog populations in many areas of the West.
    06100003-bullfrog-tadpole.jpg
  • Tadpole of American bullfrog, Rana catesbeiana, Northern California. Native to the Eastern United States, bullfrogs were introduced and have become established west of the Rockies. Bullfrogs are large, aggressive predators and prolific breeders, and have seriously depleted native frog populations in many areas of the West.
    06070021-bullfrog-tadpole.jpg
  • Tadpole of American bullfrog, Rana catesbeiana, Northern California. Native to the Eastern United States, bullfrogs were introduced and have become established west of the Rockies. Bullfrogs are large, aggressive predators and prolific breeders, and have seriously depleted native frog populations in many areas of the West.
    06010143-bullfrog-tadpole.jpg
  • Tadpole of American bullfrog, Rana catesbeiana, Northern California. Native to the Eastern United States, bullfrogs were introduced and have become established west of the Rockies. Bullfrogs are large, aggressive predators and prolific breeders, and have seriously depleted native frog populations in many areas of the West.
    06010128-bullfrog-tadpole.jpg
  • Tadpole of American bullfrog, Rana catesbeiana, Northern California. Native to the Eastern United States, bullfrogs were introduced and have become established west of the Rockies. Bullfrogs are large, aggressive predators and prolific breeders, and have seriously depleted native frog populations in many areas of the West.
    06010111-bullfrog-tadpole.jpg
  • Tadpole of American bullfrog, Rana catesbeiana.  About the time the front legs emerge, the small round mouth of the tadpole widens and transforms into that of an adult frog.  Native to the Eastern United States, bullfrogs were introduced and have become established west of the Rockies. Bullfrogs are large, aggressive predators and prolific breeders, and have seriously depleted native frog populations in many areas of the West.
    06180059.jpg
  • Tadpole of American bullfrog, Rana catesbeiana.  As it transforms into a frog, the tadpole's round mouth, adapted for feeding on plants, will gradually widen and take on a shape more suitable for a predator.  Native to the Eastern United States, bullfrogs were introduced and have become established west of the Rockies. Bullfrogs are large, aggressive predators and prolific breeders, and have seriously depleted native frog populations in many areas of the West.
    06180014.jpg
  • Tadpole of American bullfrog, Rana catesbeiana, with four legs. Native to the Eastern United States, bullfrogs were introduced and have become established west of the Rockies. Bullfrogs are large, aggressive predators and prolific breeders, and have seriously depleted native frog populations in many areas of the West.
    06180156.jpg
  • Tadpole of American bullfrog, Rana catesbeiana, with four legs. Native to the Eastern United States, bullfrogs were introduced and have become established west of the Rockies. Bullfrogs are large, aggressive predators and prolific breeders, and have seriously depleted native frog populations in many areas of the West.
    06180096.jpg
  • Tadpole of American bullfrog, Rana catesbeiana, with hind legs. Native to the Eastern United States, bullfrogs were introduced and have become established west of the Rockies. Bullfrogs are large, aggressive predators and prolific breeders, and have seriously depleted native frog populations in many areas of the West.
    06180128.jpg
  • Tadpole of American bullfrog, Rana catesbeiana, with hind legs. Native to the Eastern United States, bullfrogs were introduced and have become established west of the Rockies. Bullfrogs are large, aggressive predators and prolific breeders, and have seriously depleted native frog populations in many areas of the West.
    06180192.jpg
  • Tadpole of American bullfrog, Rana catesbeiana, with four legs. Native to the Eastern United States, bullfrogs were introduced and have become established west of the Rockies. Bullfrogs are large, aggressive predators and prolific breeders, and have seriously depleted native frog populations in many areas of the West.
    06180168.jpg
  • Tadpole of American bullfrog, Rana catesbeiana, with four legs. Native to the Eastern United States, bullfrogs were introduced and have become established west of the Rockies. Bullfrogs are large, aggressive predators and prolific breeders, and have seriously depleted native frog populations in many areas of the West.
    06180049.jpg
  • Tadpole of American bullfrog, Rana catesbeiana, with hind legs. Native to the Eastern United States, bullfrogs were introduced and have become established west of the Rockies. Bullfrogs are large, aggressive predators and prolific breeders, and have seriously depleted native frog populations in many areas of the West.
    06180045.jpg
  • Tadpole of American bullfrog, Rana catesbeiana, with hind legs. Native to the Eastern United States, bullfrogs were introduced and have become established west of the Rockies. Bullfrogs are large, aggressive predators and prolific breeders, and have seriously depleted native frog populations in many areas of the West.
    06180037.jpg
  • Tadpole of American bullfrog, Rana catesbeiana, with four legs. Native to the Eastern United States, bullfrogs were introduced and have become established west of the Rockies. Bullfrogs are large, aggressive predators and prolific breeders, and have seriously depleted native frog populations in many areas of the West.
    06180188.jpg
  • Tadpole of American bullfrog, Rana catesbeiana, with four legs. Native to the Eastern United States, bullfrogs were introduced and have become established west of the Rockies. Bullfrogs are large, aggressive predators and prolific breeders, and have seriously depleted native frog populations in many areas of the West.
    06180095.jpg
  • Tadpole of American bullfrog, Rana catesbeiana, with four legs. Native to the Eastern United States, bullfrogs were introduced and have become established west of the Rockies. Bullfrogs are large, aggressive predators and prolific breeders, and have seriously depleted native frog populations in many areas of the West.
    06180183.jpg
  • Tadpole of American bullfrog, Rana catesbeiana, with hind legs. Native to the Eastern United States, bullfrogs were introduced and have become established west of the Rockies. Bullfrogs are large, aggressive predators and prolific breeders, and have seriously depleted native frog populations in many areas of the West.
    06180041.jpg
  • Tadpole of American bullfrog, Rana catesbeiana, with four legs. Native to the Eastern United States, bullfrogs were introduced and have become established west of the Rockies. Bullfrogs are large, aggressive predators and prolific breeders, and have seriously depleted native frog populations in many areas of the West.
    06180177.jpg
  • Tadpole of American bullfrog, Rana catesbeiana, with hind legs. Native to the Eastern United States, bullfrogs were introduced and have become established west of the Rockies. Bullfrogs are large, aggressive predators and prolific breeders, and have seriously depleted native frog populations in many areas of the West.
    06180122.jpg
  • Tadpole of American bullfrog, Rana catesbeiana, with four legs. Native to the Eastern United States, bullfrogs were introduced and have become established west of the Rockies. Bullfrogs are large, aggressive predators and prolific breeders, and have seriously depleted native frog populations in many areas of the West.
    06180107.jpg
  • Tadpole of American bullfrog, Rana catesbeiana, with hind legs. Native to the Eastern United States, bullfrogs were introduced and have become established west of the Rockies. Bullfrogs are large, aggressive predators and prolific breeders, and have seriously depleted native frog populations in many areas of the West.
    06180137.jpg
  • Tadpole of American bullfrog, Rana catesbeiana, with four legs. Native to the Eastern United States, bullfrogs were introduced and have become established west of the Rockies. Bullfrogs are large, aggressive predators and prolific breeders, and have seriously depleted native frog populations in many areas of the West.
    06180141.jpg
  • Tadpole of American bullfrog, Rana catesbeiana, with hind legs. Native to the Eastern United States, bullfrogs were introduced and have become established west of the Rockies. Bullfrogs are large, aggressive predators and prolific breeders, and have seriously depleted native frog populations in many areas of the West.
    06180011.jpg
  • Egg and newly-hatched tadpoles of American bullfrog, Rana catesbeiana.  Immediately after hatching, the tadpole is about 5mm long and still has the appearance of an embryo.
    05150031-bullfrog-tadpole.jpg
  • Egg and newly-hatched tadpoles of American bullfrog, Rana catesbeiana.  Immediately after hatching, the tadpole is about 5mm long and still has the appearance of an embryo.
    05150035-bullfrog-tadpole.jpg
  • Tadpole of blue-sided treefrog or coffee frog, Agalychnis annae, an endangered species.  A small population has been established in the gardens of the Hotel Bougainvillea, San Jose, Costa Rica.
    09060218-blue-sided-treefrog-tadpole.jpg
  • Tadpole of blue-sided treefrog or coffee frog, Agalychnis annae, an endangered species.  A small population has been established in the gardens of the Hotel Bougainvillea, San Jose, Costa Rica.
    09060215-blue-sided-treefrog-tadpole.jpg
  • Tadpole of blue-sided treefrog or coffee frog, Agalychnis annae, an endangered species.  A small population has been established in the gardens of the Hotel Bougainvillea, San Jose, Costa Rica.
    09060213-blue-sided-treefrog-tadpole.jpg
  • Tadpole of blue-sided treefrog or coffee frog, Agalychnis annae, an endangered species.  A small population has been established in the gardens of the Hotel Bougainvillea, San Jose, Costa Rica.
    09060220-blue-sided-treefrog-tadpole.jpg
  • Tadpoles of black-spined toad, Duttaphrynus melanostictus. Dili District, Timor-Leste (East Timor).
    10040636-tadpole.jpg
  • Tadpoles of black-spined toad, Duttaphrynus melanostictus. Dili District, Timor-Leste (East Timor).
    10040634-tadpole.jpg
  • Santa Cruz garter snake, Thamnophis atratus atratus (Thamnophis couchii atratus), eating tadpole of California red-legged frog, Rana aurora draytonii, a Federally listed Threatened Species. After capturing the tadpole in deeper water, the snake brings it to shore and swallows it, then stretches its jaw before returning to the water. Foothills of Mount Diablo, California. Once abundant throughout California, red-legged frog populations have been dramatically reduced by habitat destruction, water pollution, suburban sprawl, and predation by non-native bullfrogs. Red-legged frogs and garter snakes have always occupied the same habitats; predation by these native snakes is not considered a significant factor in the frogs' decline.
    r943seq.jpg
  • Female Yosemite toad, Bufo canorus, resting in shallow water in a high elevation meadow in California's Sierra Nevada mountains. Also in the water are tadpoles of the same species. Once widespread in the high Sierra, since the 1980s Yosemite toads have disappeared or severely declined in over 50% of their former range, and now survive only in a handful of wet meadows. The toad is listed as a Species of Special Concern under the Federal Endangered Species Act as well as by the State of California, and is listed as Endangered by the IUCN.
    08150276.jpg
  • Female Yosemite toad, Bufo canorus, swimming in shallow water in a high elevation meadow in California's Sierra Nevada mountains. Also in the water are tadpoles of the same species. Once widespread in the high Sierra, since the 1980s Yosemite toads have disappeared or severely declined in over 50% of their former range, and now survive only in a handful of wet meadows. The toad is listed as a Species of Special Concern under the Federal Endangered Species Act as well as by the State of California, and is listed as Endangered by the IUCN.
    08150286.jpg
  • Female Yosemite toad, Bufo canorus, resting in shallow water in a high elevation meadow in California's Sierra Nevada mountains. Also in the water are tadpoles of the same species.  Once widespread in the high Sierra, since the 1980s Yosemite toads have disappeared or severely declined in over 50% of their former range, and now survive only in a handful of wet meadows. The toad is listed as a Species of Special Concern under the Federal Endangered Species Act as well as by the State of California, and is listed as Endangered by the IUCN.
    08150285.jpg
  • Female Yosemite toad, Bufo canorus, resting in shallow water in a high elevation meadow in California's Sierra Nevada mountains. Also in the water are tadpoles of the same species. Once widespread in the high Sierra, since the 1980s Yosemite toads have disappeared or severely declined in over 50% of their former range, and now survive only in a handful of wet meadows. The toad is listed as a Species of Special Concern under the Federal Endangered Species Act as well as by the State of California, and is listed as Endangered by the IUCN.
    08150293.jpg
  • Female Yosemite toad, Bufo canorus, resting in shallow water in a high elevation meadow in California's Sierra Nevada mountains. Once widespread in the high Sierra, since the 1980s Yosemite toads have disappeared or severely declined in over 50% of their former range, and now survive only in a handful of wet meadows. The toad is listed as a Species of Special Concern under the Federal Endangered Species Act as well as by the State of California, and is listed as Endangered by the IUCN.
    08150272.jpg
  • Metamorphosing black-spined toad, Duttaphrynus melanostictus. Toadlet has four legs and is able to breathe air and walk on land, but has not fully resorbed its tail.   Dili District, Timor-Leste (East Timor).
    10040652-toad.jpg
  • Metamorphosing black-spined toad, Duttaphrynus melanostictus, on the photographer's index finger.  Toadlet has four legs and is able to breathe air and walk on land, but has not fully resorbed its tail.  Dili District, Timor-Leste (East Timor).
    10040659-toad.jpg
  • Metamorphosing black-spined toad, Duttaphrynus melanostictus. Toadlet has four legs and is able to breathe air and walk on land, but has not fully resorbed its tail. Photographed on a US dime to show its size. Dili District, Timor-Leste (East Timor).
    10040654-toad.jpg
  • Metamorphosing black-spined toad, Duttaphrynus melanostictus, on the photographer's index finger.  Toadlet has four legs and is able to breathe air and walk on land, but has not fully resorbed its tail.  Dili District, Timor-Leste (East Timor).
    10040660-toad.jpg
  • Metamorphosing black-spined toad, Duttaphrynus melanostictus. Toadlet has four legs and is able to breathe air and walk on land, but has not fully resorbed its tail. Photographed on a US dime to show its size. Dili District, Timor-Leste (East Timor).
    10040656-toad.jpg
  • Metamorphosing black-spined toad, Duttaphrynus melanostictus. Toadlet has four legs and is able to breathe air and walk on land, but has not fully resorbed its tail. Photographed on a US dime to show its size. Dili District, Timor-Leste (East Timor).
    10040658-toad.jpg
  • American bullfrog, Rana catesbeiana, with partial tail. Native to the Eastern United States, bullfrogs were introduced and have become established west of the Rockies. Bullfrogs are large, aggressive predators and prolific breeders, and have seriously depleted native frog populations in many areas of the West.
    06190091.jpg
  • American bullfrog, Rana catesbeiana, with partial tail. Native to the Eastern United States, bullfrogs were introduced and have become established west of the Rockies. Bullfrogs are large, aggressive predators and prolific breeders, and have seriously depleted native frog populations in many areas of the West.
    06190047.jpg
  • American bullfrog, Rana catesbeiana, with partial tail. Native to the Eastern United States, bullfrogs were introduced and have become established west of the Rockies. Bullfrogs are large, aggressive predators and prolific breeders, and have seriously depleted native frog populations in many areas of the West.
    06190040.jpg
  • American bullfrog, Rana catesbeiana, with partial tail. Native to the Eastern United States, bullfrogs were introduced and have become established west of the Rockies. Bullfrogs are large, aggressive predators and prolific breeders, and have seriously depleted native frog populations in many areas of the West.
    06190066.jpg
  • American bullfrog, Rana catesbeiana, with partial tail. Native to the Eastern United States, bullfrogs were introduced and have become established west of the Rockies. Bullfrogs are large, aggressive predators and prolific breeders, and have seriously depleted native frog populations in many areas of the West.
    06190027.jpg
  • American bullfrog, Rana catesbeiana, with partial tail. Native to the Eastern United States, bullfrogs were introduced and have become established west of the Rockies. Bullfrogs are large, aggressive predators and prolific breeders, and have seriously depleted native frog populations in many areas of the West.
    06190026.jpg
  • American bullfrog, Rana catesbeiana, with partial tail. Native to the Eastern United States, bullfrogs were introduced and have become established west of the Rockies. Bullfrogs are large, aggressive predators and prolific breeders, and have seriously depleted native frog populations in many areas of the West.
    06190022.jpg
  • American bullfrog, Rana catesbeiana, with partial tail. Native to the Eastern United States, bullfrogs were introduced and have become established west of the Rockies. Bullfrogs are large, aggressive predators and prolific breeders, and have seriously depleted native frog populations in many areas of the West.
    06190012.jpg
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