A 120 million year old dinosaur fossil with the bones of its last snack still inside reveals what our ancestors ate.

• Paleontologist Hans Larsson found a small mammal in a dinosaur fossil.
• Carnivorous reptiles and birds, according to McGill University.
• Only one of the 21 dinosaur fossils ever found with its food inside.

A small, key survivor of four winged dinosaur species wasn’t fussy about what it ate, examination of a rare fossil has revealed.

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

“These are the only solid evidence we have of the food consumed by these long-extinct animals — and they are extremely rare,” Larsson said in the release. The revelation of the animal’s “opportunistic” eating “puts a new perspective on what ancient ecosystems can do,” he added.

Only 20 other fossils have been found with the fossilized bones of their meals inside, according to McGill, and this is the first fossil to show that any dinosaur ate mammals, the Economic Times reported.

Microraptor The fossils were first discovered in the early 2000s in Liaoning, China, located in the northern part of the region near the Yellow Sea. Scientists speculated that it was probably a dead species because it had four wings, and two additional wings were created to drag when it moved.

The ability to seek from all kinds of animals is not enough to make even two wings.