Marine mammals
Sperm whale
Physeter macrocephalus
Epipelagic zone · Mesopelagic zone · Bathypelagic zone
The unwitting hero of the novel Moby-Dick and centuries of sailors' legends of titanic battles against monsters of the deep, the sperm whale does indeed fight real duels with the giant squid, whose sucker scars it often carries on its skin.
🗺️ Geographic range
Every ocean on the globe, from tropical to subpolar waters, generally in deep water offshore.
📊 Population
Global population estimated by the IUCN at several hundred thousand individuals, still well below its pre-commercial-whaling level despite a stabilising trend.
Habitat
- Pacific Ocean · High seas / open water · Bathypelagic zone · Feeding
🥚 Reproduction
Gestation of about 14 to 16 months, a single calf, raised within a matriarchal group.
Behaviour
- Diet
- Deep-sea squid, including the giant squid and the Humboldt squid, as well as various deep-water fish.
- Hunting
- Dives on a single breath to over 2,000 m, locating prey by echolocation in total darkness.
- Communication
- Echolocation clicks among the most powerful sounds emitted by any animal, organised into "codas" unique to each clan.
- Social life
- Females and calves live in stable matriarchal groups; adult males become largely solitary.
Physiology
- Anatomy
- The largest brain known in the animal kingdom, a massive head housing the spermaceti organ.
- Respiration
- Pulmonary, can hold its breath for over an hour on its deepest dives.
- Vision
- Modest, largely compensated for by extremely powerful echolocation.
- Adaptations
- A spermaceti organ letting it focus sonar clicks powerful enough to potentially stun prey.
🔗 Web of marine life
⚡ Its extraordinary abilities
- Often carries sucker scars on its skin left by battles with giant squid
- Among the deepest divers of all marine mammals, beyond 2,000 m, on a single breath for over an hour
🏆 Records
The largest brain known in the animal kingdom
About five times heavier than the human brain.
Source: French National Museum of Natural History
One of the deepest-diving mammals
Can descend beyond 2,000 m on a single breath for over an hour.
If you cross paths with this animal…
Risk: Low toward humans, no aggressive interaction documented in the open sea.
Behaviour: Calm and curious, travels in matriarchal groups.
Advice: Keep your distance: an adult can weigh as much as a building, and its tail movements are powerful.
💡 Did you know?
- Inspired Herman Melville's novel Moby-Dick, partly based on real 19th-century whaling accounts.
- Has the largest brain known in the entire animal kingdom, about five times heavier than a human's.
