Sperm whales are the largest of the toothed whales family. They also have the largest brains of any animal currently living on this planet. They are a remarkable creature as well, in the fact that their natural habitat is the whole of the open ocean.
The sperm whale earned its name from the spermaceti organ, which occupies most of its very large head. This organ excretes an oil, which was heavily sought be whalers in the 18th and 19th centuries.