It is almost rectangular, widened at the end of the snout, and steeply truncated. On the left side of the front of the head is an S-shaped ejaculatory opening, giving a distinctive bushy forward-facing jet.
The eyes of the sperm whale do not differ much from those of other tooth fish, only–the eye of the sperm whale weighs about 170 grams and is shaped like an ellipsoid. Like other pinnipeds, the sperm whale can retract and extend its eyes thanks to a retractor muscle but is unable to rotate the eyes in the eye sockets. Its eyes provide it with good vision and light sensitivity.
