The term 'DOES' Mates' refers to two animals, the Hart and the Stag. The Hart is a species of deer that is native to Europe, Asia, and parts of North Africa. It is the male of the species and is distinguished by its large antlers. The Stag is also a species of deer, but it is the female of the species. It is smaller than the Hart and DOES not have antlers. Both the Hart and the Stag are important members of the deer family and play an important role in the ecosystem.