Walking With Wikis


This is a world where birds eat horses.

Walking with Beasts, New Dawn

Gastornis (Diatryma) was a flightless killer-bird, slightly taller than a human. It is both the largest animal, and the main antagonist in Walking with Beasts (New Dawn).


These were the largest of birds in the Eocene. Half a ton of feather and muscles and around 2.2 meters tall (larger than the average human being).

Gastornis hunting Leptictidium.

with a 45 cm skull and beak, shaped like a hatchet. Although the beak's tips weren't hooked, so this bird may have been a herbivore.

When a female Gastornis had eggs, only one egg specifically, they had to wait two months for them to hatch. These birds were fiercely territorial and, when another Gastornis got to close…females moved to protect their nest. Since the great extinction of the non-avian dinosaurs, birds were a success like mammals but, what is more, they grew big – big enough to take over the role of the large

A Gastornis running through the forest

non-avian dinosaurs. Although Gastornis was the biggest land creature of its time, it had a relatively short neck and thick legs, as opposed to terror birds of later times; in fact, despite the superficial similarities, Gastornis' closest relatives were ducks and chickens, while the terror birds (phorusracids) are actually closely related to cranes, seriemas, etc. Put otherwise, Gastornis was most likely an ambush predator, while the terror birds had to actively run down their proportionally bigger prey. There are also theories that Gastornis might have actually been an omnivorous, or even a herbivorous bird, contrary to its depiction in the program.

Portrayal in the Series

Gastornis was portrayed as the apex predator of the Early Eocene rainforests. It only laid one egg at a time. Because of its size and flightlessness, it made its nests on the ground, where its eggs and hatchlings were vulnerable to various predators.

In the Walking With series

Gastornis as it appears in the intro

Walking with Beasts

New Dawn

Gastornis was shown hunting small mammals, such as Leptictidium and Propalaeotherium, and it laid its single egg on the ground, just as the modern flightless birds do. This is why a swarm of giant ants was able to kill and eat the hatchling while the adult Gastornis hunted in another part of the forest. This event foreshadowed the eventual extinction of the Gastornis species overall: as the global jungle vanished, replaced by a new scrubland (and mangrove) habitat, the giant killer birds (such as Gastornis) vanished, to be replaced by new mammalian carnivores, such as Hyaenodon and Andrewsarchus.


  • Gastornis was widely said to be a carnivore until early 2014, which body structures led scientists classify it as a herbivore, and it's giant beak were hypothesized to crack up plants, but the debate is open, and some scientists say that this bird was omnivorous (eating clams, little animals, roots, big seeds, ...), but until stomach contents are found, no one will know for sure.


Appearances in Other Media

Video Games

Read more at the Jurassic Park Wiki

Read more at the Jurassic Park Builder Wiki

Read more at the Scribblenauts Wiki

   Gastornis' design in WWB was reused for the video games Jurassic Park Builder and the Scribblenauts series.

Ice Age

Read more at the Ice Age Wiki

The Diatryma from Ice Age shares the same colors as the WWB Gastornis, only arranged in a different pattern. Unlike in WWB, they are correctly shown to not be apex predators.