Max length: 18 m
Max weight: 44 tons
Largest of the toothed whales, sperm whales have an enormous box-like head with a single blowhole on the left of head at the front. Body is dark grayish; skin often appears wrinkled behind head. Back has a rounded or triangular hump followed by “knuckles” along spine. Found only in deep water, they can be seen singly or in groups up to fifty.