Gastornis

The Gastornis (Gastornis geiselensis) was a flightless bird that lived in a period called the Eocene. The Eocene period is the earliest period we will inform you about. The Gastornis lived about 44-49 million years ago. They are known to be as tall as a fully grown man. They like to eat Propalaeotherium, Leptictidium, and other mammals, but it depends on their size. Because they are so big, they have to lay their eggs on the ground. They can't get up to trees, since they are flightless. When they catch something to eat, they shake the animal vigorously until every bone breaks. They look a bit like ostriches and they run quite fast. Gastornis are quite cool.