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Science & Nature • Marine mammal

Fin whale

The fin whale (*Balaenoptera physalus*) is a baleen whale and the second-largest animal and cetacean after the blue whale.

By Ethan Anderson| Reviewed by Olivia Bennett, Standards & Fact-Checking Lead| Updated July 27, 2026|2 min read| Fact-checked

The fin whale (Balaenoptera physalus) is a baleen whale and the second-largest animal and cetacean after the blue whale. It is also known as the finback whale or common rorqual. The species has a near-global oceanic distribution and is listed as Vulnerable on the IUCN Red List.

Description

Fin whales have a streamlined body, a pointed snout, and a prominent dorsal fin set far back on the body. They are among the fastest of the large whales and are sometimes called the "greyhound of the sea."

Distribution and habitat

The species occurs in most major oceans and is most often associated with temperate to cold waters. It generally prefers deep offshore habitats, though it can also be seen in coastal areas.

Feeding and behaviour

Fin whales are baleen feeders that consume krill, small schooling fish, and sometimes squid. They feed by engulfing prey-rich water and filtering it through baleen plates.

Conservation

Fin whales were severely reduced by commercial whaling in the 19th and 20th centuries. Global protections have allowed some recovery, but threats still include ship strikes, entanglement, acoustic disturbance, and prey reduction.

Key facts

  • Fin whales are the second-largest whale and second-largest cetacean after the blue whale.
  • They are baleen whales, feeding by filtering prey such as krill and small fish from seawater.
  • The species is found in oceans worldwide, especially in temperate and subpolar waters.
  • Fin whales were heavily hunted during the industrial whaling era.
  • The IUCN currently classifies the species as Vulnerable.
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Canadian context

Fin whales occur in Canadian waters, including the North Atlantic and North Pacific, where they are part of Canada’s marine mammal fauna and are relevant to conservation, shipping, and whale-watching interests.

Frequently asked questions

What is the scientific name of the fin whale?
The scientific name is Balaenoptera physalus.
How big is a fin whale?
Adults can reach about 27 metres in length and around 80 tons in weight, making them the second-largest whales after blue whales.
Where do fin whales live?
Fin whales are found in oceans worldwide, especially in temperate and subpolar waters, and usually spend time in deep offshore habitats.
What do fin whales eat?
They feed on krill, small fish, and sometimes squid, using baleen plates to filter prey from seawater.
Are fin whales endangered?
The IUCN classifies the species as Vulnerable globally, although some regional populations have different assessments.
Why are they called fin whales?
The name refers to the hooked dorsal fin on their back, which sits far behind the head near the tail.

References

  1. International Whaling Commissionhttps://www.iwc.int/about-whales/whale-species/fin-whale
    Supports: Species identity, size, distribution, and conservation context.
  2. IFAWhttps://www.ifaw.org/animals/fin-whales
    Supports: Scientific name, size, diet, distribution, and IUCN Vulnerable status.
  3. Hebridean Whale & Dolphin Trusthttps://www.hwdt.org/fin-whale
    Supports: Range, diet, size, and population information.
  4. Wikipediahttps://www.wikipedia.org/wiki/Fin_whale
    Supports: Common names and general species description.
  5. World Wildlife Fundhttps://www.worldwildlife.org/species/fin-whale
    Supports: Scientific name, size, habitat, and conservation context.