Livyatan was essentially a very large sperm whale with large teeth on the upper and lower half of their jaws that used echolocation to find prey, and megalodon was similar to a great white shark ...

Estimates suggest megalodon actually grew to between 15 and 18 metres in length, three times longer than the largest recorded great white shark. It may have been comparable in length to today's ...

Then there were killer sperm whales, a now-extinct type of sperm whale. They grew as large as megalodon and had even bigger teeth. They were also warmblooded; that meant they enjoyed an expanded ...

Megalodon’s favorite prey – small whales – vanished and it had to compete with other hunters such as the predatory sperm whale Livyatan and modern great white sharks. By 3.6 million years ...

it's closer in length to a modern sperm whale. Its stomach may have held 10,000 litres, that's enough for it to have eaten 20 whole cows...if cows swam in the sea. How big are the megalodon's ...

Estimates suggest megalodon actually grew to between 15 and 18 metres in length, three times longer than the largest recorded great white shark. It may have been comparable in length to today's ...

According to scientists at the Monterey Bay Aquarium Research Institute (MBARI), sperm whales frequent the deep waters around Monterey Bay much more than previously thought. The researchers ...

Read more about sperm whales: http://j.mp/sOSais Watch underwater footage of the mammal and hear its strange clicking sounds that are crucial to their survival (02:15 ...

In fact, a T-rex would have been a quick snack for megalodon. Its head would have easily fit inside the gargantuan shark's mouth.

Last year, the Shark Week team built a full-size model of megalodon, to see if it could hunt and kill giant whales. You can see video on the Shark Week website.

A new study on sperm whales off the coast of Ireland has found females and their calves are swimming in higher latitudes than before. The presence of the whales at higher latitudes is most likely ...

The presence of female sperm whales has become more frequent off the coast of Ireland, which could be linked to climate change, according to a new study. The study on female, juvenile and calf ...