A pale-throated sloth (Bradypus tridactylus) hangs out in a tree. (Image credit: Alberto Carrera via Getty Images)

Which animals have the longest arms? 

Based on size alone, humpback whales (Megaptera novaeangliae) would easily crush all other competition with their massive flippers, which evolved from the arms of their terrestrial mammalian ancestors and can measure up to 16 feet (4.9 meters) long. 


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