Ospreys and Deer

Although the Ospreys have all left the nest, they are still hanging around

 This looks like the male, but it's hard to tell.

 Along the path, I saw this Mule Deer doe. She was laying down, but got up when I raised the camera. I had the two dogs with me, fortunately leashed.

 She was not disturbed at all.

 I wonder why they call them "Mule" deer? Maybe because of the ears?