There are a number of Deer species. We’re familiar with Mule Deer and Whitetail Deer since that’s what is native to North America. In Africa the Red Deer belongs to the same family. In Asia there are numerous species of deer: Siberian Roe Deer, Sika Deer, Thorold's Deer, Central Asian Red Deer, Chital, Hog Deer, Barasingha, Indian Sambar, and Indian Muntjac (and I probably missed some). European deer include European Red Deer and European Roe Deer. Central and South American deer include: Taruca or North Andean Deer, Chilean Huemul or South Andean Deer, and the small Brocket Deer and Pudus, the latter being the smallest deer in the world.
Depending on species and where you live, male deer are called stags, harts, bucks, or bulls, and females are called hinds or does. In North American bucks and does are the most common terms.