Last week while I was sitting at my desk I saw a huge flash of white out of the corner of my eye as a couple of Mourning Doves flew down to the base of my feeder. Since White-winged Doves can show up anywhere in the US, I'm always half-way looking for them. I rushed to the window to check out the dove only to be confronted by this guy (on left).
A Mourning Dove with white tail feathers. Just goes to show you have to double check those field marks when you get a quick look at a bird--and need more than one field mark to ID a bird. In this case a bird with a few white feathers can superficially mimic a well-known field mark of another species. According to the Birds of North America account, partial albinism like this is rare in Mourning Doves and usually involves wing feathers.
Scheyville National Park
37 minutes ago