ichthyosaurs were large extinct marine reptiles that lived from 250 to 90 million years ago

predator monster jurassic paleontology dinosaur gigantic skull head carnivore primitive extinct strong dangerous fossil strength wild death large prehistoric reptile ancient science history skeleton museum cretaceous archaeology animal era realistic scientific giant fierce terrible biology zoology herbivore nature ichthyopterygia fish flippers evolved land reptiles dolphins triassic phalanges lizard england sea ocean whales