Fin Whale

Overview

The fin whale (Balaenoptera physalus) is a massive baleen whale and the second-largest animal on Earth, surpassed in size only by the blue whale. These streamlined giants are found in all major oceans, typically favoring cool temperate and polar latitudes for their seasonal migrations.

Distribution & habitat

Fin whales have a global distribution, inhabiting major oceans worldwide. They are highly migratory, generally spending summer months feeding in high-latitude, productive waters and moving to warmer, mid-latitude regions during winter for breeding and calving.

Appearance

Known for their long, slender, and graceful body shape, fin whales feature a V-shaped head with a single prominent ridge running down the center. A unique characteristic of this species is its asymmetrical head coloration: the right side of the lower jaw is white, while the left is dark gray. Their dorsal surface is typically dark gray, fading to a white underside. They possess a sickle-shaped dorsal fin located well back on the body and roughly 100 throat pleats that allow the mouth to expand significantly during feeding.

Biology & behavior

Fin whales are fast swimmers, capable of reaching speeds up to 32 km/h. They are generally solitary or found in small groups, though they may congregate in larger numbers in rich feeding grounds. Males produce low-frequency, repetitive vocalizations, which are believed to play a role in courtship and attracting mates. They are long-lived animals, with an estimated lifespan of 80 to 100 years.

Feeding

As filter feeders, fin whales use 350 to 400 baleen plates to strain prey from the water. They primarily consume krill and small schooling fish, often employing lunge-feeding techniques. Research indicates they can significantly increase their energy intake by targeting dense prey patches at greater depths.

Reproduction

Breeding and calving typically occur in warmer waters during the late fall or winter. Females generally give birth to a single calf every two to three years.