This is the largest of all Eocene birds, Gastornis, a half-pile of muscle and feather as tall as a grown man.
— Allen, about Gastornis

Gastornis ("Gaston's Bird"), also known as Diatryma, was a very large, prehistoric genus of flightless predatory bird. It was smaller and more robust than the terror bird; it lived 56-41 MYA, mainly native during the Paleocene and the early Eocene Europe- specifically Germany and France -and North America.

Strangely, it's been questioned whether this animal was a herbivore or a carnivore or even an omnivore. Nonetheless, Gastornis was the apex predator for the Paleocene and much of the Eocene that ruled over the plethora of small animals that had survived the K-T Extinction of the dinosaurs 65 MYA, dying out only when larger mammalian predators such as Hyaenodon evolved.



Gastornis lived during the Early Eocene period over 50 million years ago. It was the top predator of its time.


The Largest of all predatory birds in the Eocene, Gastornis were the top predators of their world during their time. They stood about 6 feet tall, as tall as a grown human, and weighed 1000 lbs., making them the second largest flightless bird ever to exist, after the Terror Birds Phorusrhacos.


1000px-WWB1x1 GastornisCheckingEgg

Female Gastornis with an egg

Gastornias were solitary creatures, only getting together during mating season. When female Gastornias laid eggs, the had to wait two months for them to hatch. These birds were also fiercely territorial and when another Gastornias (whether it be male or female) got to close, the mothers moved to protect their nest.

Since the great extinction of the dinosaurs, birds like Gastornis had been a success like all mammals but, what was more, they grew large – enough so to take over the role of the predatory dinosaurs, from as small as the lethal Velociraptors to as giant as even the terrifying Tyrannosaurus Rex.