Today’s Wonder of the Day was inspired by Alli. Alli Wonders, “What makes sloths so slow?” Thanks for WONDERing with us, Alli!
Do you enjoy a lazy day now and then? Of course you do! Who doesn't?
The word “sloth" came from the Greek and Latin words for “carelessness" and “laziness." In the 1600s, scientists began to use “sloth" as a name for arboreal (tree-dwelling) mammals in the jungles of Central America and South America.
But were they being fair to sloths? Are these animals really lazy?
Sloths comprise six species of mammals belonging to either the Megalonychidae (two-toed) or Bradypodidae (three-toed) family. Classified this way because of their specialized claws, sloths are related to armadillos and anteaters.
Sloths are "folivores," which means they eat mostly leaves and buds from trees. Unfortunately, leaves don't provide much in the way of nutrition or energy.
Sloths have large stomachs with many special compartments that help break down the tough leaves. At any particular time, two-thirds of a sloth's weight might consist of what's in its stomach!
Since leaves provide so little energy, sloths must adapt in several different ways. Not only does their digestion process move very slowly, but their body temperatures are also lower than other mammals their size.
They move only when necessary, and when they do move, they move very slowly. In fact, they move so slowly that sloths are the slowest mammals in the world.
Although sloths were once thought to spend up to 18 hours sleeping each day, scientists now believe that sloths usually sleep only 10 hours each day. Are they just being lazy the rest of the day?
Sloths would probably tell you they're just digesting and conserving what little energy they get from the leaves they eat!