It's a good thing sloths don't have to go to school. They'd never make it on time. These drowsy tree-dwellers sleep up to 20 hours a day! And even when they are awake, they barely move at all. In fact, they're so incredibly sluggish, algae actually grows on their fur.
Sloths live in the tropical forests of Central and South America. With their long arms and shaggy fur, they resemble monkeys, but they are actually related to armadillos and anteaters. They can be 2 to 2.5 feet (0.6 to 0.8 meters) long and, depending on species, weigh from 8 to 17 pounds (3.6 to 7.7 kilograms).
There are two main species of sloth, identified by whether they have two or three claws on their front feet. The two species are quite similar in appearance, with roundish heads, sad-looking eyes, tiny ears, and stubby tails.
Some scientists think sloths developed their slow-motion lifestyle so they would be less noticeable to predators such as hawks and cats, which rely heavily on their eyesight when hunting. The algae that grows on sloths' fur also helps them avoid predators by letting them blend in with green leaves.
Sloths eat mainly leaves and fruit and get most of the water they need from plants. They are clumsy and virtually helpless on land and rarely come down from the trees. About once every week, they descend to go to the bathroom, slowly moving about by digging their front claws into the dirt and dragging their bodies.
If they are caught by a predator, sloths turn from sluggish to slugger, biting fiercely, hissing, slashing with their claws, and shrieking. The three-toed sloth is even nicknamed ai (pronounced "eye") in Latin America for the high-pitched scream the species lets out when bothered.
 Two-toed sloths are in the genus Choleopus.
 Three-toed sloths are in the genus Bradypus.
Sloths are clumsy on land but are very good swimmers.
Now answer these questions
1.   How many hours do sloths sleep each day?
2.  What grows on their fur?
3.  Where do sloths live?
4. How many species of sloths are there?
5.  What do they eat?