It has more of a falcon look to its beak and head... that is "staring daggers" really, isn't it? Wow. I really like this photo! Not much left of the pigeon, I say! Very good to capture it while feeding. It might not be for those weak of stomach, but this is how they survive. They need to feed on other animals.
Now who flew into the window?
This falcon (if it is one) or the pigeon?