What would you get if you crossed a whale with a shark? Maybe something like Leviathan melvillei, a long-extinct, hypercarnivorous whale with teeth longer than any T. rex ever had.
L. melvillei lived between 12 million and 13 million years ago and represents one thing we don’t have in the oceans today — a macropredator, a hypercarnivorous whale. L. melvillei would have been a top predator of its time along with the giant shark, Megalodon.
The skull of Leviathan melvillei is 3 metres (10 ft) long. The teeth of L. melvillei are up to 36 centimetres (1.18 ft) long and are claimed to be the largest of any animal yet known. Read more here.