about two-thirds of the way down the animal, and the bones of the hindlegs could still articulate with them. However, the limb bones were so small that it is difficult to imagine what use they would have been, or indeed if they showed outside the body at all.

Basilosaurus must have swum in the Eocene oceans by undulating its long body and tail. For the cylindrical body to have worked efficiently as a swimming organ, this whale most probably had tail flukes.

The head was typical of the early whales, although it was small in proportion to the body. The nostrils were high up on the snout, and the teeth were of different shapes and sizes. The front teeth were pointed and conical, while the back teeth were saw-edged. (An obsolete name for this animal is Zeug-lodon, which means "saw toothed.") These large early whales must have hunted fish and squid in deep waters, as do the larger species of modern toothed whale, such as the sperm whale.

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