Hinds' Mates is a term used to describe two species of deer, the Red Deer (also known as STAGS) and the Fallow Deer (also known as HARTS). These two species are closely related and often found in the same habitats. They are both members of the Cervidae family, which includes all species of deer, elk, and moose. The term Hinds' Mates is derived from the fact that the female of each species is referred to as a Hind.