Sloths have one of the slowest metabolisms of any mammal. Their leafy diet is low in energy and hard to digest, so a single meal can take weeks to pass through their multi-chambered stomach. Moving slowly conserves the little energy they extract from those leaves.
Slowness is also great camouflage. By barely moving, sloths avoid the notice of sharp-eyed predators like harpy eagles, and algae growing in their fur gives them a greenish tint that blends into the rainforest canopy. What looks like laziness is really a masterclass in energy efficiency.
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