While they may be known as one of nature's laziest animals, sloths are also host to some very unusual and perhaps surprising attributes.
1. They are the only 'green' mammals.
Sloth fur is long and coarse and, while it is not actually green, the slow movement and inactivity of sloths allows algae enough time to grow in the fur, giving it a greenish tint. The algae are harmless to the sloth and help to camouflage them in the tree tops.
Graeme Churchard / Flickr / CC BY 2.0