Despite being a fearsome predator

Altirhinus kurzanovi was an ornithopod dinosaur from the Early Cretaceous

including its bony tail

The two animals crashed into the water with a deafening splash and the Tylosaurus carried it to the bottom of the ocean

Desmostylus hesperus Protemnodon Despite being a fearsome predatorDesmostylus hesperus was a semi aquatic marine mammal from the Miocene belonging to Desmostylia, an extinct order of mammals known exclusively from the North Pacific. Unlike sirenians, pinnipeds or cetaceans, desmostylians represented a distinct evolutionary lineage that has completely disappeared. They have traditionally been associated with Tethytheria, the broader evolutionary group that includes sirenians and proboscideans. The generic name means