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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New York's Bronx Zoo is celebrating the first birthdays of six tiger cubs, two sets of triplets born in the spring of 2010. Now that they're more than a year old they are considered adolescents. Seen here are three Amur tigers, a Malayan breed. The zoo says there are fewer than 3,500 tigers in the wild, 1,000 of which are breeding females. (Julie Larsen Maher/WCS)
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