In most species of deer, only the male grows a yearly set of antlers, while the females have only stubs. However, "reindeer" (caribou), like the moose, occupy their own genus of the deer family and both genders have antlers. In the Scandinavian variety, older males lose their antlers earlier than young males (in December), and only females keep their antlers until summer. (This would mean Santa's reindeer are perpetually young, or female?)
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Deer are smaller in body and antler size than elk are, and lack the darker, heavier coat around the neck and the patch of white at the rump. Male elk are called bulls and male deer are called bucks. Bull elk will have larger, heavier and a wider spread/rack of antlers than a buck will, regardless if it's one of the biggest white-tail bucks or mule-deer bucks a hunter's ever seen.
The female has sleek hips. Males ALWAYS have antlers. The female walks differently.