The skull of the sperm whale is asymmetrical and compressed, having been deformed by evolution more than the skull of any other mammal. The upper jaw is flattened, wide and long to hold the spermaceti organ. The first cervical vertebra of the neck is free, but the other six cervical vertebrae are fused as a single unit. An individual tooth may weigh over 2.5 lbs.
Females have fewer, smaller teeth than do males.
The spermaceti organ may also play a role in focusing sounds produced by the whale during echolocation, by changing the shape of the organ to control how narrow or wide the beam of sound emitted will become. Whale Songs is a product of Lance Leonhardt, Black Box and Oasis Telecommunications. Designed and by Black Box , published by Oasis Telecommunications .