Owls can rotate their head about their neck 270 degrees plus or minus a few degrees see for example: https://www.youtube.com/watch?v=M6p6R... from earlier this year. read more
It’s a myth that owls can turn their heads 360 degrees. They can, however, swivel them up to 270 degrees — and scientists have finally figured out how they do this without cutting off the blood supply to their brain. read more