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• a  inhabiting or frequenting trees

• Recent research in comparative anatomy has tended to displace the lemurs, as human ancestors, in favor of a small, tree-living nocturnal animal called Tarsius which has a thumb .
• South-central Asia, millions of years ago, was covered with a luxuriant forest swarming with tree-living primates of all sorts.

• arboreal
• arboreous

• nonarboreal