Steller's Sea Eagle Identification Guide

Key Field Marks

• Size & shape: An enormous eagle, among the heaviest raptors on Earth, with a wingspan up to about 2.5 meters, a bulky body, broad long wings, and a proportionally massive head and bill.
• Bill: Huge, deep, bright orange-yellow bill, notably larger and more prominent than that of Bald Eagle — one of the most striking features of the species.
• Plumage: Overall blackish-brown body, with contrasting bright white on the shoulders (lesser wing coverts), thighs, and a wedge-shaped white tail; adults are unmistakable with this pattern.
• Legs & feet: Bright yellow legs and feet, with powerful talons adapted for catching large fish.
• Juveniles: Duller brown overall with less defined white patches, mottled underwing coverts, and a dark-tipped bill that yellows with maturity over several years.

Separating It From Similar Species

• White-tailed Eagle: Smaller and more uniformly brown with a smaller, though still yellow, bill, an all-white wedge tail but no white shoulder or thigh patches; ranges overlap in eastern Russia.
• Bald Eagle: Not normally range-overlapping (Bald Eagle is North American, Steller's Sea Eagle is Asian/rare vagrant to North America), but if compared, Bald Eagle has a fully white head and tail rather than a mostly dark body with white shoulder/thigh patches, and a noticeably smaller bill.
• Juvenile Steller's vs. juvenile White-tailed Eagle: Both are mottled brown and challenging, but Steller's shows a proportionally larger bill and bulkier structure even as a juvenile.
• Adult Steller's Sea Eagle's combination of huge orange bill, dark body, and white shoulder/thigh/tail patches is diagnostic and not shared by any other eagle.

Where & When to See It

• Habitat: Coastal areas, estuaries, and major rivers rich in fish, particularly where salmon are spawning; also found around sea ice edges in winter.
• Range: Breeds mainly in far eastern Russia (Kamchatka Peninsula, Sea of Okhotsk coast, Sakhalin); winters primarily in Japan (especially Hokkaido) and the Kuril Islands, with rare vagrants recorded in Alaska and elsewhere in North America.
• Season: Best viewed at coastal Japanese wintering grounds (Hokkaido) roughly December-March, when large numbers congregate; breeding activity occurs May-September in Russia.
• Behavior: Feeds primarily on fish (especially salmon), supplemented by seabirds, carrion, and occasionally mammals; often seen perched on ice floes, riverbanks, or dead trees near water, sometimes in large winter congregations.

Voice & Song Cues

• Gives deep, resonant barking or croaking calls, often "ra-ra-ra" or a deep gull-like croak, typically heard around nest sites or when interacting with other eagles over food.
• Vocalizations are lower-pitched and harsher than those of the smaller Bald Eagle.
• Calls are most often heard during territorial disputes or feeding congregations rather than in routine daily activity.