The mule deer separated by sheets of ice, they had to go their separate ways. One stayed in the frigid climate while the other half went to warmer climates across the land. They had to adapt their new environment and over many generations of continuous breeding they adapted to become whitetail deer. They had a thinner coat due to the warmer climate, they changed to a light brownish fur to hide from their predators in dry grass. Their diet had to change due to the food variation. Overall they went through speciation going from one species into two.
Whitetail deer have undergone an interesting history as they have evolved from their mule deer ancestors. White tail deer are big stocky animals that live up in the mountains and in the foothills. They have a brownish fur coat to stay warm on the cold nights. The whitetails deer ancestor is the odocoileus hemionus also known as the Mule deer. There was a big climate change far back in time also known as the ice age. The mule deer separated by sheets of ice, they had to go their separate ways. This is the conclusion to the story of the mule deer's