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

The fossil of a Microraptor with the bones of its last meal, a small mammal inside it.

Hans Larsson

• 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. 

"These finds are the only solid evidence we have about the food consumption of these long-extinct animals – and they are exceptionally rare," Larsson said in the release. The revelation that the animal was an "opportunistic" eater "puts a new perspective on how ancient ecosystems may have worked," 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 time a fossil has shown that any dinosaur ate mammals,  the Economic Times reported. 

Microraptor fossils were first discovered in the early 2000s in Liaoning, China, located in the northeast part of the country along the Yellow Sea. Scientists have speculated that the species likely died out because it had four wings, and the two additional wings created drag when it moved.

Its ability to make a snack out of all kinds of animals may not have been enough for make up for two too many wings.

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