This is insane. One the one hand it's like something you'd see in a cartoon, on the other hand it's one of the most metal things I've seen a bird do. And I used to raise chickens.
My chickens LOVED mice. Seeing them fight over one was like watching a bunch of t-rexes tearing apart a goat. It wasn't pretty, but I couldn't avert my eyes from the carnage.
I'm a huge fan of birds, both modern and prehistoric. And a bird's gotta do what a birds gotta do to fill it's belly. With that, here's the video of a Gull swallowing a rabbit whole. How he doesn't choke on it is a mystery to me.