Posted this with a bunch of Cookie's other images a few weeks back (
Link to other pics), but thought it might get a few more looks if it went solo. Had a black doe in the area about 5 years back figuring it was a once in a lifetime deal. A black mule deer fawn made an appearance this season, so now it's twice in one's lifetime.
It was a product of a twin birthing and note the tail on its sibling. Also a bit unusual for a mule deer. Typical tail on the buck in the first image.