Sloths sleep for up to 20 hours per day. When they are awake, they move so slowly that algae grows on their fur. According to National Geographic, some scientists believe that the slow movements and algae camouflage make... More » Pets & Animals Mammals Marsupials

Three-toed sloths are mammals that live in South and Central America. They weigh 8 to 10 pounds and have an extra vertebrae in their necks that allows them to turn their heads a full 270 degrees. They also have a distinc... More » Pets & Animals Mammals

The Quaternary Period includes the most recent 2.6 million years of the geologic time scale and is the time period in which humans first appeared. During the Quaternary Period, 30 percent of Earth's surface was covered b... More » Science Earth Science

A 2008 study shows that sloths in the wild sleep for about nine hours, while sloths in captivity appear to sleep for 15 to 20 hours per day. The study monitored three-toed sloths, so the sleeping patterns of the larger t... More »

While sloths are lethargic and non-aggressive, they possess 4-inch claws that they use to defend themselves from predators. However, on the ground they can only travel about 53 feet per hour, making them easy to evade. More »

According to a 2012 study by the Zoological Society of London, there are likely fewer than 100 pygmy three-toed sloths remaining in the wild. The population census was conducted during a nine-day expedition to Escudo Isl... More »

Possums are arboreal marsupials indigenous to Australia and New Guinea. They are different animals than the North American opossum, which is sometimes also called a possum. More »