GERRY PEARCE / SCIENCE PHOTO LIBRARY GERRY PEARCE / SCIENCE PHOTO LIBRARY
Koala hand. Hand of a koala (Phascolarctos cinereus), showing its two thumbs (top). Koalas are arboreal herbivorous marsupials native to Australia. They have evolved this two-thumb adaptation to help them climb the eucalyptus trees they spend most of their life in. Photographed on Kangaroo Island, Australia.
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