Large head
Head can represent up to one-third of total body length and contains spermaceti.
Species Guide
What to know about sperm whales
A clean field guide focused on habitat, identification, behavior, and conservation context without burying the useful parts.
The sperm whale (Physeter macrocephalus) is the largest of the toothed whales and the largest toothed predator. It is the only living member of the genus Physeter and one of three extant species in the sperm whale superfamily Physeteroidea, alongside the pygmy and dwarf sperm whales (genus Kogia). Sperm whales are pelagic with a worldwide range and migrate seasonally for feeding and breeding. Females and young males live in groups and cooperate to protect and nurse young, while mature males are largely solitary outside the mating season. Females give birth every four to twenty years and care for calves for more than a decade. Mature males average about 16 metres in length, with the head representing up to one-third of total length. Sperm whales are capable of very deep dives (documented to about 2,250 metres) and use echolocation and powerful vocalizations (reported source levels up to 236 dB re 1 μPa m). Their heads contain spermaceti, and ambergris is sometimes produced in their digestive system. Lifespan can exceed 70 years. The species was heavily targeted by historic whaling for spermaceti and ambergris; it is currently protected by the International Whaling Commission moratorium and listed as Vulnerable by the IUCN.
Listed as Vulnerable by the IUCN and protected under the International Whaling Commission moratorium; historically heavily impacted by commercial whaling for spermaceti and ambergris.
Pelagic with a worldwide distribution; individuals migrate seasonally for feeding and breeding. Females and young males form groups while mature males are largely solitary outside the mating season.
Identification
How to identify sperm whales
The visual markers divers can use underwater, plus the species most likely to cause confusion.
Key identification markers
Size
Mature males average about 16 metres in length.
Toothed whale
Sperm whales are the largest of the toothed whales and the largest toothed predator.
Deep-diving capability
Known to dive to around 2,250 metres.
Common lookalikes
Pygmy and dwarf sperm whales (Kogia spp.)
Other extant members of the sperm whale superfamily Physeteroidea; smaller than Physeter macrocephalus.
Range and Movement
How sperm whales move through the world
The broad range, seasonal movement, or migratory behavior that shapes where divers encounter this species.
Pelagic with a worldwide distribution; individuals migrate seasonally for feeding and breeding. Females and young males form groups while mature males are largely solitary outside the mating season.
Conservation
What is happening with Sperm Whales
Status, pressure, and protection context grounded in cited sources rather than filler.
Listed as Vulnerable by the IUCN and protected under the International Whaling Commission moratorium; historically heavily impacted by commercial whaling for spermaceti and ambergris.
Main threats
Historic commercial whaling
Spermaceti and ambergris were major targets for the whaling industry, and sperm whaling was a major 19th-century industry.
Protections and controls
International Whaling Commission moratorium
The species is protected by the IWC moratorium on commercial whaling.
IUCN listing
Listed as Vulnerable by the International Union for Conservation of Nature.
Responsible Encounters
How to dive with sperm whales
Conservation-minded guidance for divers who want the encounter without adding pressure.
Give sperm whale space, avoid blocking the animal's path, and follow local site and operator rules for wildlife interactions with whales.
Field Notes
Interesting things worth knowing
Useful species context that makes the encounter more meaningful once you are underwater.
Field notes
Loudest animal
Sperm whale vocalizations have been measured with source levels as loud as 236 decibels re 1 μPa m, among the loudest of any animal.
Largest brain
Sperm whales have the largest brain of any animal, more than five times heavier than a human brain.
Spermaceti and ambergris
Their heads contain spermaceti; ambergris is sometimes produced in their digestive system and has been valued commercially.
Long-lived
Individuals can live 70 years or more.
Deep divers
Capable of plunging to depths around 2,250 metres.
FAQ
Frequently asked questions
Clear planning and conservation answers written for search visibility and AI retrieval.
Research Sources
Sperm Whale information sources
Primary and credible references behind the field-guide and conservation claims on this page.
Sources 3Last Updated
Sperm whale · Encyclopedia · Wikipedia
Primary wildlife guide source.
Sperm Whale · Encyclopedia · Britannica
Supporting wildlife source.
Physeter macrocephalus · Taxonomy · WoRMS
Taxonomy reference.
Related Species
More in Whales
Related species guides in the same encounter family.
