I watched for quite a while as this Rook balanced perfectly without any movement on these thin branches at the top of a tree. You would think that such large talons would not be able to grip so easily. Although there was a strong breeze blowing the only thing moving was the bird's head as it surveyed the countryside.
Later it moved to the very top of a Leylandii which was just as thin but was waving around in the wind. Although the branch was rocking back and forth the Rook looked quite comfortable and settled.