elasmosaurus marine reptile

america animal aquatic behemoth bird birds capture carnivore carnivorous claw creature cretaceous dinosaur dolichorhynchops elasmosaurus era evolution extinct extinction feathers fish flight flippers flying for illustration image kansas life lizard look marine monster north northropi ocean one organism osborni picture platyurus plesiosaur prehistoric prey primeval primitive pterodactyl pterodactyloid pterosaur quetzalcoatlus reptile reptiles sea swim teeth the themes tries underwater vertebrate wildlife wing