Three-toed sloth clinging tree

Born a tree hugger

If your ideal day involves snoozing and munching snacks, three-toed sloths can relate. They spend 15 to 20 hours a day sleeping, and even while awake they're the slowest mammal on dry land (well, sort of dry—this is a rainforest, after all). As for eating, sloths stick to a fairly bland diet of leaves, but thanks to their tough digestive systems and efficient use of energy, a low-nutrient diet is enough to do the job. Even so, a quick bite is rarely out of their long limbs' reach, since they spend most of their time up in the trees.