World ‘Exceptionally rare’ discovery shows a dinosaur ate a mammal around 120 million years ago December 27, 2022December 28, 2022Jordan Mendoza, USA TODAYComments Off on ‘Exceptionally rare’ discovery shows a dinosaur ate a mammal around 120 million years ago About 120 million years ago, the Microraptor zhaoianus ate an animal about the size of a mouse, proving dinosaurs did eat mammals.