Check out the claws on this male (I think?) koala as he rests in the shade during the afternoon heat at the San Diego Zoo's "Koalafornia" exhibit. The koalas' curved, sharp claws help them to climb trees, and their two opposable digits on their front paws help them grasp branches as they climb. (We humans have only one opposable digit: our thumbs.)
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ABOUT THE AUTHOR(S)
Jason G. Goldman is a science journalist based in Los Angeles. He has written about animal behavior, wildlife biology, conservation, and ecology for Scientific American, Los Angeles magazine, the Washington Post, the Guardian, the BBC, Conservation magazine, and elsewhere. He contributes to Scientific American's "60-Second Science" podcast, and is co-editor of Science Blogging: The Essential Guide (Yale University Press). He enjoys sharing his wildlife knowledge on television and on the radio, and often speaks to the public about wildlife and science communication.