A 120-million-year-old dinosaur fossil with the bones of its final snack still inside of it reveals its enjoyed eating our ancestors

• Paleontologist Hans Larsson found a small mammal foot in the rib of a dinosaur fossil. 
• The reptile was carnivorous and bird-like, according to McGill University.
• It's one of only 21 dinosaur fossils ever found with its food inside of it. 

The key to a small, four-winged dinosaur species' survival was not being fussy about what it ate, the examination of a rare fossil revealed. 

Paleontologist Hans Larsson, a professor at McGill University, was the first to notice a small mammal foot lodged in between the bones of a fossilized Microraptor, a carnivorous dino with birdish wings. The discovery shows the dino ate a long list of animals, including mammals, fish, birds, and lizards, the university announced in a December 21 press release. 

A 120-million-year-old dinosaur fossil with the bones of its final snack still inside of it reveals its enjoyed eating our ancestors