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  • 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.
    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.
    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, 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.
    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.
    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.  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, 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.
    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.
    06100057-red-legged-frog-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
  • Hybrid African clawed frog, Silurana sp.  Native to sub-Saharan Africa, clawed frogs were exported worldwide in the 1940s and 1950s for use in human pregnancy tests, and were later sold widely as pets.  Feral populations are now established in many countries, including the United States, where they are a threat to native amphibians and fish.  Especially large populations exist in California, preying on endangered California red-legged frogs, Rana aurora draytonii, and endangered unarmored threespine sticklebacks, Gasterosteus aculeatus williamson.  Recent evidence suggests the chytrid fungus that is currently decimating frog populations around the world originated in Africa and was spread by these frogs.
    06050252-african-clawed-frog.jpg
  • Hybrid African clawed frog, Silurana sp.  Native to sub-Saharan Africa, clawed frogs were exported worldwide in the 1940s and 1950s for use in human pregnancy tests, and were later sold widely as pets.  Feral populations are now established in many countries, including the United States, where they are a threat to native amphibians and fish.  Especially large populations exist in California, preying on endangered California red-legged frogs, Rana aurora draytonii, and endangered unarmored threespine sticklebacks, Gasterosteus aculeatus williamson.  Recent evidence suggests the chytrid fungus that is currently decimating frog populations around the world originated in Africa and was spread by these frogs.
    06050223-african-clawed-frog.jpg
  • Hybrid African clawed frog, Silurana sp.  Native to sub-Saharan Africa, clawed frogs were exported worldwide in the 1940s and 1950s for use in human pregnancy tests, and were later sold widely as pets.  Feral populations are now established in many countries, including the United States, where they are a threat to native amphibians and fish.  Especially large populations exist in California, preying on endangered California red-legged frogs, Rana aurora draytonii, and endangered unarmored threespine sticklebacks, Gasterosteus aculeatus williamson.  Recent evidence suggests the chytrid fungus that is currently decimating frog populations around the world originated in Africa and was spread by these frogs.
    06050079-african-clawed-frog.jpg
  • Hybrid African clawed frog, Silurana sp.  Native to sub-Saharan Africa, clawed frogs were exported worldwide in the 1940s and 1950s for use in human pregnancy tests, and were later sold widely as pets.  Feral populations are now established in many countries, including the United States, where they are a threat to native amphibians and fish.  Especially large populations exist in California, preying on endangered California red-legged frogs, Rana aurora draytonii, and endangered unarmored threespine sticklebacks, Gasterosteus aculeatus williamson.  Recent evidence suggests the chytrid fungus that is currently decimating frog populations around the world originated in Africa and was spread by these frogs.
    06050229-african-clawed-frog.jpg