Steller Sea Lion

Overview

The Steller sea lion (Eumetopias jubatus) is the largest member of the Otariidae family, often referred to as eared seals. These powerful marine mammals are widely distributed across the cold waters of the North Pacific, where they play a significant role in coastal ecosystems as both predators and prey.

Distribution & habitat

Steller sea lions inhabit an arc across the North Pacific, ranging from central California and the Pacific Northwest through Alaska and the Aleutian Islands, extending to the coasts of Russia and Japan. They are semi-aquatic, requiring both marine environments for foraging and terrestrial sites, such as rocky reefs, ledges, and gravel beaches, for breeding and resting. These terrestrial sites are categorized as rookeries for breeding or haul-outs for non-breeding activities.

Appearance

This species exhibits strong sexual dimorphism, with males significantly larger and heavier than females. Adult males can reach lengths of up to 3.4 meters and weigh as much as 1,120 kilograms, while females typically reach up to 2.9 meters and 350 kilograms. Males are distinguished by a thick, coarse mane around their necks. Their coloration generally ranges from light blonde to reddish-brown, often appearing darker when wet.

Biology & behavior

Steller sea lions are highly social animals that congregate in large groups. They utilize sensitive facial whiskers to navigate and detect prey while underwater. Their life history is tied to traditional rookeries where they engage in polygynous mating. While they are skilled divers capable of reaching depths of 400 meters, they remain vulnerable to predation by killer whales.

Feeding

As opportunistic carnivores, they forage primarily between the intertidal zone and the outer continental shelf. Their diet is diverse, consisting of various fish species—such as pollock, salmon, cod, and herring—as well as cephalopods like squid and octopus.