2 things made this tricky.
- There's no real sense of scale in the picture. Parus suggested that the bird had a waxwing-like profile, and I can see what he means, but in real life the bird is much smaller.
- The wind caught the head in a way that makes it look like it has a bit of a crest. Just trust me that it doesn't.
No blog comments, but I received a couple real-life guesses and thought I'd better lay it to rest publicly before everyone forgets about it completely.