'Sleep with one eye open'- click on the enlarged view to see what I'm talking about. In fact, I found this article on the subject: http://www.cnn.com/TECH/science/9902/03/birds.eye/. I'm sure there's more recent research but it's interesting just the same.I even got this video of the bird cleaning itself:
I have more pictures to come, including a mystery bird- perhaps a female tanager or oriole. It was a great day!