Watch this Great Blue Heron stalk, snatch, and swallow a gopher and you'll get a sense of how terrifying it must have been to be a small prehistoric proto-mammal just trying to survive without getting gobbled up by a dinosaur.
Also: OMG you can still see the gopher wriggling around as it moves down the bird's esophagus! (Okay, yeah, those could be the bird's throat muscles. Possibly. A smart bird wouldn't want to swallow an angry gopher until it was at least mostly dead.)
[via Scicurious on Facebook]