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
Jason G. Goldman is a science writer based in Los Angeles. He writes about human and animal behavior, wildlife biology, ecology and conservation for Scientific American, the BBC, Earth Touch, Conservation magazine and elsewhere. He completed his PhD studying avian cognition at the University of Southern California and is editor of Science Blogging: The Essential Guide (Yale University Press, 2016). He is also completely obsessed with raccoons.