Steller’s sea eagle lives near water; on narrow strips of coast, together with forested valleys along lower reaches of rivers. They are generally found at elevations ranging from sea level to approximately 100 meters (328 feet). These eagles are believed to have a lifespan of about 20 years or more. Steller’s sea eagle is the largest of all sea eagles and the heaviest known eagle.

With forward-facing eyes, Steller’s sea eagle has a wide field of binocular vision. But they can use both monocular and binocular vision, meaning they can use they eyes independently or together depending on what they are looking at. They are diurnal, meaning they are active during the day and rest during the night.

Steller’s sea eagle mainly feeds on fish. Their favored prey in river habitats are salmon and trout. Among these, pink salmon and chum salmon are reportedly favored, sometimes intensely supplemented by grayling and three-spined stickleback. In addition to fish, they eat crabs, shellfish, squid, small animals, water-dwelling birds, and carrion.