Quick answer
Key facts about fin whale — size, diet, habitat, and conservation in one place.
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.