On a clear, cold day, I came across this Cooper's Hawk sitting grandly in the sunshine. (Same bird as here, I'm pretty sure.) As before, she didn't seem to care that I was nearby. I think she was trying to catch as many photons as possible, while maintaining a nice thick boundary layer of air within her feathers. Note how fluffed-up she is.
Nevertheless, she had still managed find a perch in which it wasn't possible to obtain a totally branch-free portrait.
Unrelated note: I have had to activate the word recognition step in Comments. Yes, spam.