I think there should be an extinct animal DLC. But it shouldn't be the first one they make, because extant animals should have priority in a game like this, but if you're gonna preach to me about how it "IsN't ReAlIsTiC!", don't bother commenting. You can create floating islands and put elephants in tiny little crates, this game isn't realistic. If we were to get extinct DLCs, I would want to see these animals
Tyrannosaurus
Giganotosaurus
Spinosaurus
Velociraptor
Dilophosaurus
Ornitholestes
Coelophysis
Hadrosaurus
Anatotitan
Shantungosaurus
Triceratops
Styracosaurus
Ankylosaurus
Polacanthus
Edmontonia
Sauropelta
Iguanodon
Stegosaurus
Kentrosaurus
Dakosaurus
Mosasaurus
Megalodon
Livyatan
Odobenocetops
Dodo
Haast's Eagle
Argentavis
Giant Moa
Smilodon
Mammuthus
Coelodonta
Dimetrodon
Edaphosaurus
Ophiacodon
Cephalaspis
Brontoscorpio
Megalograptus
Hynerpeton
Hyneria
Stethacanthus
Dinogorgon
Labyrinthodontia
Scutosaurus
Diictodon
Lystrosaurus
Any Therocephalian
Chasmatosaurus
Tyrannosaurus
Giganotosaurus
Spinosaurus
Velociraptor
Dilophosaurus
Ornitholestes
Coelophysis
Hadrosaurus
Anatotitan
Shantungosaurus
Triceratops
Styracosaurus
Ankylosaurus
Polacanthus
Edmontonia
Sauropelta
Iguanodon
Stegosaurus
Kentrosaurus
Dakosaurus
Mosasaurus
Megalodon
Livyatan
Odobenocetops
Dodo
Haast's Eagle
Argentavis
Giant Moa
Smilodon
Mammuthus
Coelodonta
Dimetrodon
Edaphosaurus
Ophiacodon
Cephalaspis
Brontoscorpio
Megalograptus
Hynerpeton
Hyneria
Stethacanthus
Dinogorgon
Labyrinthodontia
Scutosaurus
Diictodon
Lystrosaurus
Any Therocephalian
Chasmatosaurus