The tongue is dedicated to all those who at least once associated sloths with slowness. "Slow as a sloth, " they say, but behind the slow-motion gait of these funny animals could be a precise anti-predator strategy. Some experts have hypothesized that the placid movements of the three-toed sloths (fam. Bradypodidae) actually serve to prevent some particularly skilled birds of prey in distinguishing moving objects, such as the harpy eagles (Harpia harpyja) that are among the main predators of this species (watch the video of an attack on a sloth and a BBC cameraman). But the extraordinary "calm" with which these mammals move to the ground can also be a consequence of their metabolism: they feed on leaves that require a great expenditure of energy for digestion.

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