Steller’s Sea Cow - Growing to about 30 feet long, the slow-swimming sea cow was once abundant across much of the North Pacific. After less than 30 years of hunting by European seal hunters, fur traders, and sailors, Steller’s Sea Cow became extinct in
15 Extinct Bird Species & Possible Reasons for Their Extinction
Parasaurolophus is a genus of ornithopod dinosaur from the Upper Cretaceous of what is now North America, about million years ago. It was a herbivore that walked both as biped and a quadruped. It probably lived in herds.