This ancient marine mammal is considered one of the first ancestors of modern cetaceans

Without hesitating

aunque también podía desplazarse de forma bípeda

Kentrosaurus had a large number of teeth in its jaws

It had four strong legs adapted for swimming

Deinonychus Rugops This ancient marine mammal isDeinonychus (D. antirrhopus, 'Terrible Claw') is a genus of theropod dinosaur that lived in what is now North America during the Early Cretaceous through the Aptian and Albian periods, about 115 108 million years ago. It was a medium sized bipedal predator, with an estimated length of between 3 and 4 meters and a weight of around 70 100 kilograms. Deinonychus is known for having a unique anatomy that made it a very effective predator. It possessed