He's doing that head twist I see so often when birds are scanning the ground for munchies. whenever I see them perched on a heavily slanted branch like this I think they must have a natural, internal set of gimbals and gyroscope that allows them to effortlessly do this.
If you've ever wanted to make a difference but found it hard to believe that one person could... check out the Kiva Team Caedes discussion thread and discover that anything is possible.
-Nik