gastornis in forest (terror bird)

animal beaks biology bird birds bones carnivore carnivorous cassowary diatryma dinosaur dinosaurs eggs eocene extinct extinction feather feathers fighting flightless forest fossils gastornis gastornithidae giant giganteus huge illustration miocene nature nest ornithology ostrich paleocene paleontology phorusrhacids phorusrhacos plumage predator prehistoric prey raptor scales talons territory terror wings