It also takes sharks, skates, and fish. Dives may last for 80 minutes or more. Females and young males form schools of 20-40 individuals. These are joined by bull males during the breeding season. Larger aggregations are occasionally seen.
Young males form loose bachelor herds, but become increasingly solitary as they age.
Giant sperm whales are migratory, following the summer from northern to southern hemispheres. The habits of Kogia are less well known. These whales feed primarily but not exclusively on squid, with one species foraging in deep oceanic waters and the other over the continental shelf. Kogia appear to be solitary or to live in small pods. Giant sperm whales were extremely important to the whaling industry.