While whitetail deer also eat lichen, they don’t have such an adaptation, and reindeer are far more efficient when it comes to digesting one of the only foods they have during winter.

1. Mule Deer vs Whitetail: Ears and Face Mule deer, left, have huge ears and gray face. Whitetails, right, have smaller pointer ears and a brown face with white patches. John Hafner Photography ...

The whitetail deer is one of North America's largest animals. There are more than a dozen subspecies of whitetail deer. The largest occur in the northern U.S. into parts of Canada. These often ...

While the mule deer has 99 problems, it’s too early to tell if the whitetail is one, at least in a direct competition, though there has certainly been pearl clutching on the matter.

Mule deer faces are gray, sometimes very light-gray (at least in the fall), while whitetail faces are tawny or brownish, with white typically found around the eyes, nose, and mouth.