Alaska Department of Fish & Game biologist Phil Mooney was tagging mountain goats on Baranof Island outside of Sitka in late August and saw the unusual animal from his helicopter.
"While we were flying in to drop me on the ridge we spotted them. I actually thought it was a goat mixed in with the deer, which we have seen sometimes. But it turned out to be this deer."
The Sitka black-tailed deer is a buck, still in velvet. The animal is a very light, bluish gray. When a black bear has this kind of coloring, it's called a "glacier bear."
Read more, and see a photo, at KCAW: Goat survey finds "glacier deer"