National Geographic : 1911 May
O CROSS-SECTION Of THE HEAD OF A SPERM WHALE This species of whale carries two rows of 20 or 25 heavy teeth in its lower jaw. The teeth may beobserved inthe left portion of this picture. The teeth assist in holding the giant squid and cuttlefish, on whichthe enormous animal feeds. This picture also shows very clearly the layer of blubber surrounding the flesh (see pages 414 and439).