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A skull of Basilosaurus cetoides.

Basilosaurus was the largest predatory whale to roam the oceans. Some 18-20 meters long and weighing up to 60 tons, they were ferocious hunters, forever on the look-out for prey to maintain their massive bodies. Their anatomy suggests that they were not able to dive deep and had to seek their prey close to the surface of the see. They did not have a melon organ like modern day toothed whales and dolphins. The exact function of that organ is not known, but it is believed to aid echolocation and provide buoyancy for deep diving. (9) They also had remnants of hind limbs, which could only snap in and out into two positions and probably aided the whale during copulation. Fossils have been found in the USA, Egypt (Fayum deposits) and Pakistan. (10)