Sure, their hair is a bit nappy looking, but that smile and sweet demeanor makes them irresistible nonetheless. Sloths seem like the most content of all tree-dwelling creatures, leisurely going about their way, never in a rush. Though they might resemble primates, they're actually most closely related to anteaters. Their sedentary lifestyle is an adaptation to their diet, which consists mostly of low-calorie leaves. By moving so sluggishly, sloths conserve their energy.
Oddly, sloths might also be among the best swimmers of all tree-dwelling animals. They are known to regularly swim across rivers and streams, especially during the flood season in the Amazon basin, to reach new feeding grounds.