Gary Mulcahey / NMNH Some 17,000 years ago, on a wall of Lascaux cave in southwestern France, an artist made a painting of a deer with fantastically elongated antlers. To modern eyes, it looks ...

Whitetail deer, for example, consume small twigs and leaves, while reindeer have been known to eat bird eggs and even fish when necessary. Reindeer have more prominent and denser antlers than ...