A newborn Kihansi spray toad rests on the back of an adult female. Reared at New York's Bronx Zoo, these amphibians, extinct in the wild, are part of an international program to return the species to its former habitat in Tanzania. (Julie Larsen Maher/Wildlife Conservation Society)
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An adult female Bornean Rainbow Toad. These are the first photographs of the colorful, spindly-legged creature, which hasn't been seen since 1924. (Indraneil Das/Institute of Biodiversity and Environmental Conservation/AP Photo)
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A frog sits on a U.S. dime in this photo taken by Louisiana State University herpetologist Christopher Austin near the Amau River in Papua, New Guinea. The species was claimed as the world's smallest vertebrate, Jan. 11, 2012. (Christopher Austin/Louisiana State University/AP Photo).
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