We all know the usual suspects when it comes to animals that swim: whales, dolphins, sea turtles, tuna. But what about land mammals that need to travel across a body of freshwater, or simply go for a dip to cool down?

A model for conservation, the Amazon Region Protected Areas ensures 150 million acres—three times the size of all US parks combined—of the Amazon are protected for life.

Sloths—the adorable and lethargic animals living in treetops—depend on the health and survival of Central and South American tropical forests. Take a look at some common questions about sloths whose habitat WWF helps protect.