Great shot, think he must have heard something, maybe an alarm call. He's looking for any danger before he resumes feeding, but he is giving you the chance to this wonderful shot.
Oh dear, I didn't know they could turn all the way around like that! Isn't it funny that they are called red-bellied? I get them confused with the red headed. I need to try some bird shots soon. Hopefully next week...or the next...or the next. :)