Sperm Whale

Identification

The sperm whale is the largest of all toothed whales and the largest toothed predator on Earth. Mature males average 16 metres in length, with a distinctively enormous head that can represent up to one-third of the animal's total body length. This massive cranium is filled with spermaceti, a semi-liquid waxy substance that gives the species its name. The sperm whale has visible teeth only in its lower jaw, a feature reflected in one of its alternative scientific names, catodon, meaning 'down-tooth'. Its alternative common name, cachalot, derives from archaic words for tooth or big head across Romance and possibly Basque languages.

The sperm whale possesses the largest brain on Earth—more than five times heavier than a human brain. These remarkable marine mammals can live 70 years or more, making them long-lived inhabitants of the world's oceans.

Range & Habitat

The sperm whale is a pelagic mammal with a worldwide range. It is highly migratory, moving seasonally to exploit feeding and breeding opportunities across ocean basins. This cosmopolitan distribution makes it one of the most widespread cetaceans, found in both hemispheres wherever suitable deep-water habitat exists.

Behaviour & Diet

Sperm whales display fascinating social structures that differ markedly by sex. Females and young males live together in stable groups, while mature bulls (males) adopt a solitary lifestyle except during the mating season. Females cooperate to protect and nurse their young, giving birth every four to twenty years and caring for calves for more than a decade. A mature, healthy sperm whale has no natural predators, though calves and weakened adults may occasionally be killed by pods of orcas.

These whales are exceptional divers, plunging to depths of 2,250 metres, making them the third deepest diving mammals after the southern elephant seal and Cuvier's beaked whale. They navigate and hunt in the darkness using echolocation and vocalization at source levels as loud as 236 decibels underwater—the loudest of any animal.

Best Time & Places to See It

As a pelagic species with worldwide distribution, sperm whales can be encountered in deep ocean waters across the globe. Their seasonal migrations mean that viewing opportunities vary by location and time of year, with the best encounters typically occurring in areas where whales concentrate for feeding and breeding. Pelagic boat trips departing from coastal regions are the primary way to observe these deep-diving cetaceans.

Photography Tips

Photographing sperm whales presents unique challenges due to their deep-diving behavior and time spent underwater. Patient observation from pelagic vessels is essential, as whales must surface to breathe between dives. The massive head and distinctive body shape provide striking photographic subjects. Capture the dramatic moment of surfacing or the characteristic fluked tail as the whale begins a deep dive. Wide-angle lenses work well for environmental shots of these enormous marine mammals in their ocean habitat.