The largest sea lion, and the only one of its kind
Steller sea lions are the biggest of all sea lion species, and unlike most other seals and sea lions, this one is the sole member of its genus. Bulls grow dramatically larger than females, developing a thick mane of coarse fur around the neck and shoulders that gives the species its alternate name. Both sexes are tawny to reddish-brown, paler than the darker California sea lion they sometimes share a beach with.
An Alaska-centered range along the Pacific coast
The species is overwhelmingly concentrated in Alaska, where the bulk of all US records originate, with progressively smaller numbers reported down the coast through Washington, Oregon, and California. Records stay close to sea level throughout, tied to the rocky islands, headlands, and haul-out beaches the species depends on for resting and breeding. Sightings climb sharply each summer, peaking from June through August when sea lions gather in large numbers on traditional rookeries to breed and pup. A bull will defend a stretch of breeding beach against rival males for weeks at a stretch, and a growling roar carries well across a crowded rookery, letting animals identify rivals and mates in the chaos of a breeding colony.
Diet, predators, and a mixed conservation picture
Steller sea lions hunt fish almost exclusively, taking Pacific cod, herring, pollock, and salmon among a broad range of prey, and occasionally take smaller pinnipeds including California sea lions. In turn, they’re hunted by orcas and great white sharks, particularly younger and smaller animals. Some western Alaska populations crashed sharply in the late twentieth century for reasons still debated among researchers, from fishery competition to shifting ocean conditions, while other populations further east have stayed stable or grown. That uneven picture is part of why the IUCN currently rates the species Near Threatened rather than a status reflecting either full recovery or continued decline.
Slow growth, long lives
Females don’t reach breeding age until about five years old, and males take even longer, closer to seven. A female typically raises a single pup after a nine-month pregnancy, and individuals can live past thirty years. That slow pace of reproduction is part of what makes population recovery gradual even where conditions improve.
