A rival to Livyatan melvillei, this massive shark possessed a bite force of 167,200 to 250,000 Newtons. It flourished between 300 to 400 million years ago before going extinct due to climate change. It grew to lengths of 15m to 18m.

A medium-sized ancient creature that grew between 6m and 8.5m. It used its long tusks to hunt hard-shelled squid and other organisms. Its head was incredibly hard, though its swimming speed was very slow.

Known as the ruler of the Late Cretaceous seas, it resembled a crocodile and was a fast swimmer. It grew between 13m and 18.5m, with a bite force ranging from 98.2 million to 128.5 million Newtons.

An ancestor of modern whales, it lacked teeth and swallowed its prey whole. It grew to lengths of 9m to 14.7m and was a slow swimmer.

A Paleozoic creature and a remarkably ugly fish. It had a bite force of 6.79 million to 120 million Newtons and possessed numerous teeth. It grew to between 5.8m and 9.9m.

An ancestor of the sperm whale that resembled Moby Dick. It was the rival of the Megalodon, boasting a bite force of 850 million to 1.84 billion Newtons. It grew to lengths of 13m to 17.8m.

Toothless but aggressive, it attacked by ramming with its head. It grew between 10m and 15m and, like the Dorudon, is considered an ancestor of whales.

The rival of Kronosaurus, it had a bite force of 1.475 billion to 2.2 billion Newtons. It hunted long-necked plesiosaurs by biting and tearing at them. It grew to lengths of 16m to 19.8m.

An incredibly fast swimmer with a bite force of 780 million to 890 million Newtons. It attacked by biting everything with its crocodile-like snout and grew to about 12m to 15.6m.

Possessing a bite force of 1.3 billion to 1.89 billion Newtons, it was a slow swimmer but highly aggressive, attacking by biting through everything or occasionally ramming with its head.