Visitors at the Como Park Zoo and Conservatory in St. Paul, Minnesota, were treated to an unexpected surprise on Wednesday, ...

They have a very rare condition called rod monochromacy which means that they completely lack cone cells in their eyes. As a result all sloths are colour-blind, can only see poorly in dim light ...

Because of this cry these sloths are sometimes called ais (pronounced “eyes”). Three-toed sloths also have an advantage that few other mammals possess: They have extra neck vertebrae that ...