It had four limbs modified into fins

Orcinus citoniensis

probably used for display purposes or gender identification

The Pachyrhinosaurus was a herbivore

it is also known that they sometimes hunted in groups to take down larger prey

Gorgosaurus libratus Variant:Unprimed It had four limbs modifiedGorgosaurus is a genus of theropod dinosaur that lived during the Late Cretaceous period, approximately 76 to 70 million years ago. It belonged to the Tyrannosauridae family, the same family as the famous Tyrannosaurus rex. This carnivorous dinosaur lived in what is now North America, specifically in what is now Canada and the United States. Physically, Gorgosaurus shared many characteristics with other tyrannosaurids. It had a large, robust skull,