Fin Whale

Fin Whale facts at a glance

How big is a fin whale?

An adult fin whale measures 22 m long — about 13× the height of an average adult person (1.73 m) — and weighs around 50000 kg, about 714× an average adult’s body weight (70 kg).

What is a group of fin whales called?

Explore more animal collective nouns and baby animal names .

Filter feeding at scale

Fin whales gulp enormous mouthfuls of water and strain krill and fish through baleen plates — keratin fringes hanging from the upper jaw. They lunge-feed in productive upwellings and may cooperate loosely to concentrate prey.

Asymmetric coloration

The right lower jaw is white, the left dark — a unique asymmetry whose function is debated, possibly related to corralling prey while swimming on their side. A prominent dorsal fin set far back gives a sleek profile unlike blue whales.

Migration and song

Fin whales migrate between high-latitude feeding grounds and lower-latitude breeding areas. Their low-frequency vocalisations carry hundreds of kilometres underwater and may help navigation or mate finding across ocean basins.

Recovery from whaling

Industrial whaling decimated fin whales in the 20th century. Listed Vulnerable, populations are increasing in the North Atlantic and Southern Ocean where hunting has largely ceased, but ship strikes and entanglement remain significant threats.

Did you know? Fin Whale facts

• The fin whale is the second-largest animal on Earth after the blue whale, reaching 25 m (82 ft) and 70 tonnes with an asymmetric jaw colouring.
• Up to about 25 m and 70 tonnes — second only to the blue whale among all animals.
• Blue whales are larger with a mottled blue-grey body and small dorsal fin. Fin whales are slightly smaller, faster, with a swept-back dorsal fin and asymmetric jaw.
• The white right lower jaw may help fin whales see prey when rolling to feed on their right side — though the exact reason is not fully confirmed.
• Commercial whaling is banned internationally, though Iceland and Japan have taken fin whales in limited numbers. Most populations are recovering under protection.
• Conservation: Vulnerable (IUCN).

Diet & feeding

Fin Whale feeds primarily as a carnivore — krill, small fish, and copepods (filter feeder). Fin whales gulp enormous mouthfuls of water and strain krill and fish through baleen plates — keratin fringes hanging from the upper jaw. They lunge-feed in productive upwellings and may cooperate loosely to concentrate prey.

Adaptations

• Fin whales gulp enormous mouthfuls of water and strain krill and fish through baleen plates — keratin fringes hanging from the upper jaw. They lunge-feed in productive upwellings and may cooperate loosely to concentrate prey.
• The right lower jaw is white, the left dark — a unique asymmetry whose function is debated, possibly related to corralling prey while swimming on their side. A prominent dorsal fin set far back gives a sleek profile unlike blue whales.

Behaviour & ecology

• Fin whales gulp enormous mouthfuls of water and strain krill and fish through baleen plates — keratin fringes hanging from the upper jaw. They lunge-feed in productive upwellings and may cooperate loosely to concentrate prey.
• The right lower jaw is white, the left dark — a unique asymmetry whose function is debated, possibly related to corralling prey while swimming on their side. A prominent dorsal fin set far back gives a sleek profile unlike blue whales.
• Fin whales migrate between high-latitude feeding grounds and lower-latitude breeding areas. Their low-frequency vocalisations carry hundreds of kilometres underwater and may help navigation or mate finding across ocean basins.

Communication

• Fin Whale uses scent, posture, and vocal signals to mark territory and coordinate social behaviour.
• Communication intensity often peaks during breeding seasons and territorial disputes.

Habitat & range

Open oceans worldwide; migrates between feeding and breeding areas

Ecological role

Fin Whale acts as a predator that helps regulate prey populations and maintain balance in open oceans worldwide; migrates between feeding and breeding areas.

Conservation status of the Fin Whale

Sources & references

This guide is compiled and reviewed against established zoological and conservation references. Key sources for the Fin Whale:

• IUCN Red List of Threatened Species

  Conservation status (Vulnerable) reflects the IUCN Red List category for Balaenoptera physalus.

• iNaturalist — observations & photos

  Search citizen-science observations and community IDs for Balaenoptera physalus. Useful for range checks and recent sightings — not a substitute for formal Red List status.

• GBIF — occurrence data

  Global Biodiversity Information Facility species search for Balaenoptera physalus. Explore published occurrence records used in range research.

• IUCN Red List — Balaenoptera physalus.

  Conservation status (Vulnerable) and population trends.

• Animal Diversity Web — Balaenoptera physalus. University of Michigan Museum of Zoology.

  Life history, morphology, and range.

• Wikipedia — Fin Whale.

  General taxonomy and overview (cross-check primary sources).

• Global Animal Guide editorial standards

  How we research, source, review, and update every guide for accuracy.