Of Deer, Elk and Moose Antlers

It's possible the showy antlers of male deer, elk and moose have played a more subtle role in species evolution and survival than first appears.

deer, elk and moose - skeleton of Megaloceros giganteus
Deer, elk and moose are all from the same family, but the branch that produced Megaloceros giganteus (aka the Irish Elk) is now extinct. This regal creature sported the most impressive headgear of any known deer. 
ILLUSTRATION: KAY HOLMES STAFFORD