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  • Eggs of Coast Range newt (California newt), Taricha torosa torosa, with developing embryos, about 2 days old. Alameda County, California. Complete life cycle available, including mating, egg-laying, eggs with developing embryos, larval newts, and adults in summer and winter.
    1387-09.jpg
  • Newly hatched larva of Coast Range newt (California newt), Taricha torosa torosa, clinging to the side of the egg mass; other developing embryos are visible inside. Alameda County, California. Complete life cycle available, including mating, egg-laying, eggs with developing embryos, larval newts, and adults in summer and winter.
    1408-05.jpg
  • Newly hatched larva of Coast Range newt (California newt), Taricha torosa torosa, resting on top of the egg mass after hatching.  Alameda County, California. Complete life cycle available, including mating, egg-laying, eggs with developing embryos, larval newts, and adults in summer and winter.
    1407-08.jpg
  • Eggs of Coast Range newt (California newt), Taricha torosa torosa, with developing embryos, about 19 days old. Alameda County, California. Complete life cycle available, including mating, egg-laying, eggs with developing embryos, larval newts, and adults in summer and winter.
    1401-36.jpg
  • Eggs of Coast Range newt (California newt), Taricha torosa torosa, with developing embryos, about 12 days old. Alameda County, California. Complete life cycle available, including mating, egg-laying, eggs with developing embryos, larval newts, and adults in summer and winter.
    1397-12.jpg
  • Sierra newt (California newt), Taricha torosa sierrae, larval stage. Sierra National Forest, California. Complete newt life cycle available, including mating, egg-laying, eggs with developing embryos, larval newts, and adults in summer and winter.
    1513-22.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, 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, 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.
    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.
    06100087-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, 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.
    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 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.
    06100097-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.
    06070010-red-legged-frog-tadpole.jpg
  • Male and female Western fence lizards, Sceloporus occidentalis. Mendocino County, California
    12100037.jpg
  • Male and female Western fence lizards, Sceloporus occidentalis. Mendocino County, California
    12100041.jpg
  • Male and female Western fence lizards, Sceloporus occidentalis. Mendocino County, California
    12100053.jpg
  • Tadpole of Amargosa toad, Bufo nelsoni.  The species is described as sensitive and imperiled by the State of Nevada and U.S. Bureau of Land Management, but is not listed as an Endangered Species.  Oasis Valley, near Beatty, Nevada
    07100886-amargosa-toad.jpg
  • Tadpoles of Amargosa toad, Bufo nelsoni.  The species is described as sensitive and imperiled by the State of Nevada and U.S. Bureau of Land Management, but is not listed as an Endangered Species.  Oasis Valley, near Beatty, Nevada
    07100705-amargosa-toad.jpg
  • Male and female Western fence lizards, Sceloporus occidentalis. Mendocino County, California
    12100040.jpg
  • Male and female Western fence lizards, Sceloporus occidentalis. Mendocino County, California
    12100052.jpg
  • Mating pair of variegated meadowhawks, Sympetrum corruptum, at Saratoga Spring in Death Valley National Park, California
    12150451.jpg
  • A mating pair of variegated meadowhawks, Sympetrum corruptum, deposits eggs in the water at Saratoga Spring in Death Valley National Park, California
    12150449.jpg
  • A mating pair of variegated meadowhawks, Sympetrum corruptum, deposits eggs in the water at Saratoga Spring in Death Valley National Park, California
    12150446.jpg
  • Tadpole of Amargosa toad, Bufo nelsoni.  The species is described as sensitive and imperiled by the State of Nevada and U.S. Bureau of Land Management, but is not listed as an Endangered Species.  Oasis Valley, near Beatty, Nevada
    07100903-amargosa-toad.jpg
  • Tadpole of Amargosa toad, Bufo nelsoni.  The species is described as sensitive and imperiled by the State of Nevada and U.S. Bureau of Land Management, but is not listed as an Endangered Species.  Oasis Valley, near Beatty, Nevada
    07100894-amargosa-toad.jpg
  • Tadpole of Amargosa toad, Bufo nelsoni.  The species is described as sensitive and imperiled by the State of Nevada and U.S. Bureau of Land Management, but is not listed as an Endangered Species.  Oasis Valley, near Beatty, Nevada
    07100852-amargosa-toad.jpg
  • Tadpoles of Amargosa toad, Bufo nelsoni.  The species is described as sensitive and imperiled by the State of Nevada and U.S. Bureau of Land Management, but is not listed as an Endangered Species.  Oasis Valley, near Beatty, Nevada
    07100778-amargosa-toad.jpg
  • Tadpoles of Amargosa toad, Bufo nelsoni.  The species is described as sensitive and imperiled by the State of Nevada and U.S. Bureau of Land Management, but is not listed as an Endangered Species.  Oasis Valley, near Beatty, Nevada
    07100706-amargosa-toad.jpg
  • Tadpoles of Amargosa toad, Bufo nelsoni.  The species is described as sensitive and imperiled by the State of Nevada and U.S. Bureau of Land Management, but is not listed as an Endangered Species.  Oasis Valley, near Beatty, Nevada
    07100701-amargosa-toad.jpg
  • A mating pair of variegated meadowhawks, Sympetrum corruptum, deposits eggs in the water at Saratoga Spring in Death Valley National Park, California
    12150447.jpg
  • A mating pair of variegated meadowhawks, Sympetrum corruptum, deposits eggs in the water at Saratoga Spring in Death Valley National Park, California
    12150445.jpg
  • Tadpole of Amargosa toad, Bufo nelsoni.  The species is described as sensitive and imperiled by the State of Nevada and U.S. Bureau of Land Management, but is not listed as an Endangered Species.  Oasis Valley, near Beatty, Nevada
    07100896-amargosa-toad.jpg
  • Tadpoles of Amargosa toad, Bufo nelsoni.  The species is described as sensitive and imperiled by the State of Nevada and U.S. Bureau of Land Management, but is not listed as an Endangered Species.  Oasis Valley, near Beatty, Nevada
    07100865-amargosa-toad.jpg
  • Male and female Western fence lizards, Sceloporus occidentalis. Mendocino County, California
    12100050.jpg
  • Mating pair of variegated meadowhawks, Sympetrum corruptum, at Saratoga Spring in Death Valley National Park, California
    12150450.jpg
  • Tadpoles of Amargosa toad, Bufo nelsoni.  The species is described as sensitive and imperiled by the State of Nevada and U.S. Bureau of Land Management, but is not listed as an Endangered Species.  Oasis Valley, near Beatty, Nevada
    07100703-amargosa-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.
    06190076.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
  • Rain Frog eggs, probably from Fitzinger's Rainfrog or Robber Frog, Craugastor fitzingeri, near Arenal Volcano National Park, La Fortuna, Costa Rica
    17050398.jpg
  • Egg mass of Red-eyed Treefrog, Agalychnis callidryas, on a leaf in Sarapiquí, Costa Rica
    17050374.jpg
  • Red-eyed Treefrog, Agalychnis callidryas, in amplexus (mating) at Tirimbina Biological Reserve, Costa Rica.
    17050354.jpg
  • Red-eyed Treefrog, Agalychnis callidryas, in amplexus (mating) at Tirimbina Biological Reserve, Costa Rica.
    17050352.jpg
  • Red-eyed Treefrogs, Agalychnis callidryas, in amplexus (mating) in Tortuguero National Park, Costa Rica
    17050161.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, 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
  • 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.
    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.
    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.
    06190019.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
  • 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.
    06190010.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.
    06180041.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, 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.
    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.
    06010108-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
  • Eggs of Hourglass Treefrog, Dendropsophus ebraccatus (formerly Hyla ebraccata), on a leaf near Arenal Volcano National Park, La Fortuna, Costa Rica. Also called the Harlequin Treefrog.
    17050412.jpg
  • Rain Frog eggs, probably from Fitzinger's Rainfrog or Robber Frog, Craugastor fitzingeri, near Arenal Volcano National Park, La Fortuna, Costa Rica
    17050400.jpg
  • Rain Frog eggs, probably from Fitzinger's Rainfrog or Robber Frog, Craugastor fitzingeri, near Arenal Volcano National Park, La Fortuna, Costa Rica
    17050399.jpg
  • Red-eyed Treefrog, Agalychnis callidryas, metamorph emerging from a pond in  Sarapiquí, Costa Rica
    17050375.jpg
  • Red-eyed Treefrog, Agalychnis callidryas, in amplexus (mating) at Tirimbina Biological Reserve, Costa Rica.
    17050355.jpg
  • Red-eyed Treefrog, Agalychnis callidryas, in amplexus (mating) at Tirimbina Biological Reserve, Costa Rica.
    17050353.jpg
  • Red-eyed Treefrog, Agalychnis callidryas, in amplexus (mating) at Tirimbina Biological Reserve, Costa Rica.
    17050351.jpg
  • Red-eyed Treefrog, Agalychnis callidryas, in amplexus (mating) at Tirimbina Biological Reserve, Costa Rica.
    17050350.jpg
  • Red-eyed Treefrog, Agalychnis callidryas, in amplexus (mating) at Tirimbina Biological Reserve, Costa Rica.
    17050349.jpg
  • Red-eyed Treefrogs, Agalychnis callidryas, in amplexus (mating) in Tortuguero National Park, Costa Rica
    17050163.jpg
  • Red-eyed Treefrogs, Agalychnis callidryas, in amplexus (mating) in Tortuguero National Park, Costa Rica
    17050162.jpg
  • Eggs of Red-eyed Treefrog, Agalychnis callidryas, with developing tadpoles visible. Tortuguero National Park, Costa Rica
    17050152.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, 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
  • 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.
    06190084.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.
    06190077.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.
    06190023.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.
    06190020.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.
    06190002.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.
    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.
    06180177.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.
    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.
    06180137.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 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, 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.
    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.
    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.
    06070017-bullfrog-tadpole.jpg
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