Sloths are a group of arboreal Neotropical xenarthran mammals
constituting the suborder Folivora. Noted for their slowness of
movement, they spend most of their lives hanging upside down in the
trees of the tropical rainforests of South America and Central America.
[...]
Sloths are so named because of their very low metabolism and deliberate
movements. Sloth, related to slow, literally means
"laziness", and their common names in several
other languages (e.g. French paresseux) also mean "lazy" or similar.
Their slowness permits their low-energy diet of leaves and avoids
detection by predatory hawks and cats that hunt by sight.
Sloths are almost helpless on the ground, but are able to swim. The
shaggy coat has grooved hair that is host to symbiotic green algae which
camouflage the animal in the trees and provide it nutrients. The algae
also nourish sloth moths, some species of which exist solely on sloths.
If you want to learn more about sloths, check out Wikipedia