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  • American bullfrog, Rana catesbeiana, in a pond in Mendocino County, California. Bullfrogs are native to the eastern United States, but have become established throughout the West.
    12110095.jpg
  • American bullfrog, Rana catesbeiana, in duckweed, Lemna sp. Bullfrogs are native to the eastern United States, but have become established throughout the west. Captive frog photographed in studio.
    a185-bullfrog.jpg
  • American bullfrog, Rana catesbeiana. Bullfrogs are native to the eastern United States, but have become established throughout the west. Captive frog photographed in studio.
    a154-bullfrog.jpg
  • Blue American bullfrog, Rana catesbeiana, a rare mutation of a normally green frog caused by a lack of yellow pigment in the frog's skin. Mendocino County, California.
    13090017.jpg
  • Blue American bullfrog, Rana catesbeiana, a rare mutation of a normally green frog caused by a lack of yellow pigment in the frog's skin. Mendocino County, California.
    13090015.jpg
  • Blue American bullfrog, Rana catesbeiana, a rare mutation of a normally green frog caused by a lack of yellow pigment in the frog's skin. Mendocino County, California.
    13090014.jpg
  • Blue American bullfrog, Rana catesbeiana, a rare mutation of a normally green frog caused by a lack of yellow pigment in the frog's skin. Mendocino County, California.
    13090008.jpg
  • American bullfrog, Rana catesbeiana, in a pond in Mendocino County, California. Bullfrogs are native to the eastern United States, but have become established throughout the West.
    12110092.jpg
  • American bullfrog, Rana catesbeiana, in duckweed, Lemna sp. Bullfrogs are native to the eastern United States, but have become established throughout the west. Captive frog photographed in studio.
    a203-bullfrog.jpg
  • American bullfrog, Rana catesbeiana, in duckweed, Lemna sp. Bullfrogs are native to the eastern United States, but have become established throughout the west. Captive frog photographed in studio.
    a202-bullfrog.jpg
  • American bullfrog, Rana catesbeiana, in duckweed, Lemna sp. Bullfrogs are native to the eastern United States, but have become established throughout the west. Captive frog photographed in studio.
    a192-bullfrog.jpg
  • American bullfrog, Rana catesbeiana, in duckweed, Lemna sp. Bullfrogs are native to the eastern United States, but have become established throughout the west. Captive frog photographed in studio.
    a183-bullfrog.jpg
  • American bullfrog, Rana catesbeiana, in duckweed, Lemna sp. Bullfrogs are native to the eastern United States, but have become established throughout the west. Captive frog photographed in studio.
    a179-bullfrog.jpg
  • American bullfrog, Rana catesbeiana, in duckweed, Lemna sp. Bullfrogs are native to the eastern United States, but have become established throughout the west. Captive frog photographed in studio.
    a177-bullfrog.jpg
  • American bullfrog, Rana catesbeiana, in duckweed, Lemna sp. Bullfrogs are native to the eastern United States, but have become established throughout the west. Captive frog photographed in studio.
    a172-bullfrog.jpg
  • American bullfrog, Rana catesbeiana. Bullfrogs are native to the eastern United States, but have become established throughout the west. Captive frog photographed in studio.
    a160-bullfrog.jpg
  • Blue American bullfrog, Rana catesbeiana, a rare mutation of a normally green frog caused by a lack of yellow pigment in the frog's skin. Mendocino County, California.
    13090019.jpg
  • Blue American bullfrog, Rana catesbeiana, a rare mutation of a normally green frog caused by a lack of yellow pigment in the frog's skin. Mendocino County, California.
    13090016.jpg
  • Blue American bullfrog, Rana catesbeiana, a rare mutation of a normally green frog caused by a lack of yellow pigment in the frog's skin. Mendocino County, California.
    13090013.jpg
  • Blue American bullfrog, Rana catesbeiana, a rare mutation of a normally green frog caused by a lack of yellow pigment in the frog's skin. Mendocino County, California.
    13090009.jpg
  • American bullfrog, Rana catesbeiana, in a pond in Mendocino County, California. Bullfrogs are native to the eastern United States, but have become established throughout the West.
    12110090.jpg
  • American bullfrog, Rana catesbeiana, in a pond in Mendocino County, California. Bullfrogs are native to the eastern United States, but have become established throughout the West.
    12110088.jpg
  • American bullfrog, Rana catesbeiana, in a pond in Mendocino County, California. Bullfrogs are native to the eastern United States, but have become established throughout the West.
    12110087.jpg
  • American bullfrog, Rana catesbeiana, in a pond in Mendocino County, California. Bullfrogs are native to the eastern United States, but have become established throughout the West.
    12110084.jpg
  • American bullfrog, Rana catesbeiana, in duckweed, Lemna sp. Bullfrogs are native to the eastern United States, but have become established throughout the west. Captive frog photographed in studio.
    a210-bullfrog.jpg
  • American bullfrog, Rana catesbeiana, in duckweed, Lemna sp. Bullfrogs are native to the eastern United States, but have become established throughout the west. Captive frog photographed in studio.
    a209-bullfrog.jpg
  • American bullfrog, Rana catesbeiana, in duckweed, Lemna sp. Bullfrogs are native to the eastern United States, but have become established throughout the west. Captive frog photographed in studio.
    a208-bullfrog.jpg
  • American bullfrog, Rana catesbeiana, in duckweed, Lemna sp. Bullfrogs are native to the eastern United States, but have become established throughout the west. Captive frog photographed in studio.
    a207-bullfrog.jpg
  • American bullfrog, Rana catesbeiana, in duckweed, Lemna sp. Bullfrogs are native to the eastern United States, but have become established throughout the west. Captive frog photographed in studio.
    a205-bullfrog.jpg
  • American bullfrog, Rana catesbeiana, in duckweed, Lemna sp. Bullfrogs are native to the eastern United States, but have become established throughout the west. Captive frog photographed in studio.
    a197-bullfrog.jpg
  • American bullfrog, Rana catesbeiana, in duckweed, Lemna sp. Bullfrogs are native to the eastern United States, but have become established throughout the west. Captive frog photographed in studio.
    a188-bullfrog.jpg
  • American bullfrog, Rana catesbeiana, in duckweed, Lemna sp. Bullfrogs are native to the eastern United States, but have become established throughout the west. Captive frog photographed in studio.
    a184-bullfrog.jpg
  • American bullfrog, Rana catesbeiana, in duckweed, Lemna sp. Bullfrogs are native to the eastern United States, but have become established throughout the west. Captive frog photographed in studio.
    a181-bullfrog.jpg
  • American bullfrog, Rana catesbeiana, in duckweed, Lemna sp. Bullfrogs are native to the eastern United States, but have become established throughout the west. Captive frog photographed in studio.
    a180-bullfrog.jpg
  • American bullfrog, Rana catesbeiana, in duckweed, Lemna sp. Bullfrogs are native to the eastern United States, but have become established throughout the west. Captive frog photographed in studio.
    a178-bullfrog.jpg
  • American bullfrog, Rana catesbeiana, in duckweed, Lemna sp. Bullfrogs are native to the eastern United States, but have become established throughout the west. Captive frog photographed in studio.
    a176-bullfrog.jpg
  • American bullfrog, Rana catesbeiana, in duckweed, Lemna sp. Bullfrogs are native to the eastern United States, but have become established throughout the west. Captive frog photographed in studio.
    a174-bullfrog.jpg
  • American bullfrog, Rana catesbeiana, in duckweed, Lemna sp. Bullfrogs are native to the eastern United States, but have become established throughout the west. Captive frog photographed in studio.
    a170-bullfrog.jpg
  • American bullfrog, Rana catesbeiana, in duckweed, Lemna sp. Bullfrogs are native to the eastern United States, but have become established throughout the west. Captive frog photographed in studio.
    a169-bullfrog.jpg
  • American bullfrog, Rana catesbeiana, in duckweed, Lemna sp. Bullfrogs are native to the eastern United States, but have become established throughout the west. Captive frog photographed in studio.
    a166-bullfrog.jpg
  • American bullfrog, Rana catesbeiana. Bullfrogs are native to the eastern United States, but have become established throughout the west. Captive frog photographed in studio.
    a162-bullfrog.jpg
  • American bullfrog, Rana catesbeiana. Bullfrogs are native to the eastern United States, but have become established throughout the west. Captive frog photographed in studio.
    a161-bullfrog.jpg
  • American bullfrog, Rana catesbeiana. Bullfrogs are native to the eastern United States, but have become established throughout the west. Captive frog photographed in studio.
    a159-bullfrog.jpg
  • American bullfrog, Rana catesbeiana. Bullfrogs are native to the eastern United States, but have become established throughout the west. Captive frog photographed in studio.
    a156-bullfrog.jpg
  • American bullfrog, Rana catesbeiana. Bullfrogs are native to the eastern United States, but have become established throughout the west. Captive frog photographed in studio.
    a147-bullfrog.jpg
  • American bullfrog, Rana catesbeiana. Bullfrogs are native to the eastern United States, but have become established throughout the west. Captive frog photographed in studio.
    a145-bullfrog.jpg
  • Blue American bullfrog, Rana catesbeiana, a rare mutation of a normally green frog caused by a lack of yellow pigment in the frog's skin. Mendocino County, California.
    13090010.jpg
  • Foothill yellow-legged frog, Rana boylii, in the South Fork of the Eel River, Mendocino County, California
    12110135.jpg
  • American bullfrogs, 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 been a factor in declining native frog populations in many areas of the West. Captive frogs photographed in studio.
    a224-bullfrog.jpg
  • American bullfrogs, 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 been a factor in declining native frog populations in many areas of the West. Captive frogs photographed in studio.
    a214-bullfrog.jpg
  • American bullfrog, Rana catesbeiana, in duckweed, Lemna sp. Bullfrogs are native to the eastern United States, but have become established throughout the west. Captive frog photographed in studio.
    a211-bullfrog.jpg
  • American bullfrog, Rana catesbeiana, in duckweed, Lemna sp. Bullfrogs are native to the eastern United States, but have become established throughout the west. Captive frog photographed in studio.
    a206-bullfrog.jpg
  • American bullfrog, Rana catesbeiana, in duckweed, Lemna sp. Bullfrogs are native to the eastern United States, but have become established throughout the west. Captive frog photographed in studio.
    a196-bullfrog.jpg
  • American bullfrog, Rana catesbeiana, in duckweed, Lemna sp. Bullfrogs are native to the eastern United States, but have become established throughout the west. Captive frog photographed in studio.
    a190-bullfrog.jpg
  • American bullfrog, Rana catesbeiana, in duckweed, Lemna sp. Bullfrogs are native to the eastern United States, but have become established throughout the west. Captive frog photographed in studio.
    a175-bullfrog.jpg
  • American bullfrog, Rana catesbeiana, in duckweed, Lemna sp. Bullfrogs are native to the eastern United States, but have become established throughout the west. Captive frog photographed in studio.
    a171-bullfrog.jpg
  • American bullfrog, Rana catesbeiana. Bullfrogs are native to the eastern United States, but have become established throughout the west. Captive frog photographed in studio.
    a158-bullfrog.jpg
  • American bullfrog, Rana catesbeiana. Bullfrogs are native to the eastern United States, but have become established throughout the west. Captive frog photographed in studio.
    a155-bullfrog.jpg
  • American bullfrog, Rana catesbeiana. Bullfrogs are native to the eastern United States, but have become established throughout the west. Captive frog photographed in studio.
    a153-bullfrog.jpg
  • American bullfrog, Rana catesbeiana. Bullfrogs are native to the eastern United States, but have become established throughout the west. Captive frog photographed in studio.
    a146-bullfrog.jpg
  • American bullfrog, Rana catesbeiana. Bullfrogs are native to the eastern United States, but have become established throughout the west. Captive frog photographed in studio.
    a144-bullfrog.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
  • 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 been a factor in declining native frog populations in many areas of the West. Captive frogs photographed in studio.
    a244-bullfrog.jpg
  • 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 been a factor in declining native frog populations in many areas of the West. Captive frogs photographed in studio.
    a239-bullfrog.jpg
  • American bullfrogs, 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 been a factor in declining native frog populations in many areas of the West. Captive frogs photographed in studio.
    a217-bullfrog.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
  • Green frog, Rana clamitans melanota.  Native to eastern United States.
    05150246-green-frog.jpg
  • American Bullfrog, Rana catesbeiana, in a pond at the Desert Botanical Garden, Phoenix, Arizona
    19040019.jpg
  • American Bullfrog, Rana catesbeiana, in Patagonia Lake State Park, Arizona
    19040018.jpg
  • American Bullfrog, Rana catesbeiana, in Patagonia Lake State Park, Arizona
    19040016.jpg
  • 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 been a factor in declining native frog populations in many areas of the West. Captive frogs photographed in studio.
    a241-bullfrog.jpg
  • American bullfrogs, 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 been a factor in declining native frog populations in many areas of the West. Captive frogs photographed in studio.
    a237-bullfrog.jpg
  • American bullfrogs, 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 been a factor in declining native frog populations in many areas of the West. Captive frogs photographed in studio.
    a216-bullfrog.jpg
  • American bullfrogs, 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 been a factor in declining native frog populations in many areas of the West. Captive frogs photographed in studio.
    a212-bullfrog.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.
    06100097-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.
    06070010-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
  • Green frog, Rana clamitans melanota.  Native to eastern United States.
    05150247-green-frog.jpg
  • Green frog, Rana clamitans melanota.  Native to eastern United States.
    05150245-green-frog.jpg
  • Green frog, Rana clamitans melanota.  Native to eastern United States.
    05150241-green-frog.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 bullfrogs, 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 been a factor in declining native frog populations in many areas of the West. Captive frogs photographed in studio.
    a215-bullfrog.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
  • 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
  • American Bullfrog, Rana catesbeiana, in Patagonia Lake State Park, Arizona
    19040017.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.
    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
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