Despite their similar names, the two types of sloths belong to different families and have different evolutionary histories. Two-toed sloths are slightly larger and more active, while the three-toed ...

This article was published in Scientific American’s former blog network and reflects the views of the author, not necessarily those of Scientific American Everybody loves sloths, and whenever we talk ...

When you picture the jungle, your mind might jump to roaring tigers, monkeys swinging wildly from tree to tree, or bright parrots flitting between branches. But high above, in the dense green canopy, ...