Woodpecker lion. Chases you up a tree, then, pecks the tree until it falls over, with you in it.
Bloody nasty beast.

Maybe the carver, who had a specific triangular shape to fill, started off with a lion but then the Bishop visited the jobsite and say, “Um, that looks a little too frightening, can you just make it a pretty bird instead?” And this is what we ended up with. Yeah, I’m going to go with that explanation.