This is a super pretty hummingbird and can be seen every day by the feeders at the Program House. But the "white-necked" part is not always obvious. Don McFarlane asked me yesterday what kind of hummingbird is that, and I told him. His comment was that the bird appears to have white in many places but the neck is decidedly not one of them.
But once you get a couple looks at it the white is visible on the nape of the neck.
Keith Christenson - Wildlife Biologist