Sperm whale

Physeter macrocephalus
Sperm whale

Appearance

Size: max 11-18m

Key features:
- Bushy blow projected forwards to the left
- Wrinkled skin
- Large box shaped head
- Knuckles from hump to tail fluke
- Typically shows its tail when going for a deep dive.
- Can look like a log in the water when resting

The sperm whale is the largest toothed whale. It is very distinctive for its large blunt, ‘box-like’ head. It has no distinct dorsal fin, but does have a small hump two thirds of the way along its back. Sperm whales have slate grey or brown wrinkly skin. They have one blow hole on the left side of their head and a distinctive bushy blow which is at a 45 degree angle to the left.


Behaviour

Sperm whales travel in groups of 1-20 individuals. There are three main ‘groupings’ of sperm whales; “Bachelor schools” which are made up of young males, “breeding schools” which are females with young and “Solitary individuals” which are typically older males that tend to live alone or in small groups but join the breeding schools during the breeding season.

Typically when sperm whales dive they raise their triangular tail flukes vertically into the air. Once they have come up from a deep dive they are often seen logging at the surface, appearing to look like a tree trunk from a distance. Sperm whales are one of the deepest diving mammals, diving over 100m and holding their breath for up to 2 hours each time! Their primary prey consists of deep-water fish and the giant and colossal squid, which are found in deep-sea trenches and canyons.

Distribution

Sperm whales are widely distributed around the world particularly in deep offshore waters, or submarine canyons along the continental shelf. Females and young sperm whales tend to stay in the warmer tropical and subtropical regions (rarely extending beyond 45°N or 42°S), whereas males tend to go further into temperate and polar waters. Sperm whales can be seen it the Bay of Biscay, more regularly through the late spring and summer months.

Threats

In the past sperm whales were heavily exploited for their body oil and spermaceti (found in their head). These oils are used in the production of perfumes, cosmetics and candles. Sperm whales are slow growing and have low reproduction rates; therefore struggled to recover quickly from high rates of exploitation, but now they are one of the most abundant whales in our oceans. Sadly sperm whales are still hunted for meat in Japan, and the targeting of males has led to population imbalances, further reducing reproductive rates. Other human induced threats to sperm whales include marine pollutants (particularly plastic), entanglement in fishing gear, collision with ships, overfishing of prey species, climate change as this can alter their habitat and the location of food and the use of ship sonar.

Sightings Map

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