Steller's Sea Eagles in Rausu: The World's Heaviest Eagles at Arm's Length

At 6am in Rausu, the sun hasn't cleared the peaks of Kunashiri Island yet. The temperature reads -15C. Then the first eagle drops from the sky, talons extended, hitting the water three meters from your boat. Steller's sea eagles (Haliaeetus pelagicus) are typically the heaviest eagles in the world, weighing 5 to 10kg , and when one pulls a cod from the Nemuro Strait at arm's length, you understand what mass in motion looks like. The best eagle viewing usually occurs around the first two weeks of February , when drift ice and fish abundance peak simultaneously.

The Science Behind Steller's Sea Eagle Aggregations

On Hokkaido, eagles are attracted by abundant Pacific cod (Gadus macrocephalus), which peak in the Rausu Sea and the Nemuro Straits in February. This resource supports an important commercial fishery, which, in turn, helps to support eagles. Alaska pollock (Gadus chalcogrammus), along with the cod, is the most important food source for wintering eagles in Japan. These massive raptors breed along Russia's Sea of Okhotsk coast and the Kamchatka Peninsula, then migrate south in winter following the drift ice that drives their prey into concentrated feeding zones.

An immense eagle with large head and massive orange bill to match, adults are striking even from a great distance: rich brown overall, with snow-white tail, belly, and shoulder patches.

The wingspan is from 1.95 to 2.50m, with a median of 2.2m . That measurement becomes visceral when an eagle's wingtip passes over your head as it banks toward a fishing boat.

The eagles' feeding strategy centers on kleptoparasitism and opportunism. They pluck fish from icy seas and follow fishing boats for scraps. They often associate with white-tailed eagles where prey is abundant. In early 2026, about 500 Steller's sea eagles and white-tailed eagles gather in the Rausu area during winter , creating one of the densest raptor concentrations accessible to the public anywhere on Earth.

When and Where to See Steller's Sea Eagles

The core season runs February through March, with ice flows forming generally in mid-January and the best eagle viewing usually around the first two weeks of February . Eagles are very active in the early morning , so boat departures typically happen before sunrise, around 6:00am to 6:30am. The 90-minute cruises depart from Rausu Fishing Port on the eastern side of the Shiretoko Peninsula.

Access requires commitment. Fly into Nakashibetsu Airport (one hour drive to Rausu) or drive from Sapporo, which takes over six hours in winter conditions. The road into Rausu can close for 2-3 days during storms, and has been closed up to a week when washed out . Do not book lodging inside Rausu itself unless you have flexible travel dates. Stay in Shari or Nakashibetsu instead, where road access remains more reliable.

Multiple boat operators run eagle tours, but capacity fills weeks in advance during peak season. Book by December for February departures. The boats are small (40-60 passengers) and purpose-built for winter conditions, with enclosed cabins and open deck space for photography.

Shiretoko Pass Viewpoint (elevation 738m) offers an alternative if boats are full or weather cancels departures. Eagles perch in roadside trees between the pass and Rausu town, though views lack the intimacy of boat encounters. The pass road closes November through late April.

Your Witnessing Guide

Average air temperature marks -8C , but wind chill on open water pushes effective temperatures to -20C or lower. Inadequate clothing ends the experience in 20 minutes. Layer as follows: thermal base layer (merino wool or synthetic), insulating mid-layer (fleece or down), windproof and waterproof outer shell. Wear insulated boots rated to -30C, a balaclava that covers your neck, and two pairs of gloves (thin liner gloves under insulated shells). Bring hand warmers. You will be standing on a moving boat in sub-zero wind for 90 minutes.

Photography settings: ISO 800-1600, shutter speed minimum 1/2000s to freeze wing motion, aperture f/5.6 to f/8 for depth of field on birds in flight. Bring a camera with a zoom in the 70-400mm range. Also bring another one with a 35mm wide focal lens. No need for longer focal length lenses at all. The tripod or monopod will only get in your way and the way of other passengers. The eagles come close enough that 600mm lenses can't focus. Weather-seal your camera body. Sea spray and snow will hit your lens.

The boats pitch and roll. If you're prone to seasickness, take medication 30 minutes before departure. The cabin provides shelter, but the best shots happen on deck. Crews throw fish scraps to attract eagles, so be prepared for birds diving toward the boat from multiple angles simultaneously. Keep your camera ready and your footing secure.

Safety considerations: hypothermia risk is real. If your fingers go numb, get inside immediately. Frostbite begins faster than you expect. The boat railings ice over. Handrails are slippery. Watch your step when moving around the deck.

Why It Matters

Steller's sea eagles are classified as vulnerable by the IUCN. They are legally protected, being classified as a national treasure in Japan and mostly occurring in protected areas in Russia, but many threats to their survival persist. The current population is estimated at 5,000 and decreasing.

Threats mainly include habitat alteration, industrial pollution, and overfishing, which in turn decrease their prey source. On Hokkaido specifically, overfishing by humans in Japanese waters has led the birds to scavenge on sika deer remains left by hunters. Eating carrion filled with lead shot from hunters has had devastating effects on the sea-eagle population, leading to the outlawing of lead ammunition on Japan's Hokkaido Island. Enforcement of that ban remains inconsistent.

The Rausu fishery creates an unusual conservation dynamic. Commercial cod fishing provides the eagles with accessible food, but overfishing threatens the same resource base. Local fishing cooperatives now coordinate with researchers to monitor eagle populations and adjust practices during peak aggregation periods. The boat tours, while commercial, fund ongoing population surveys and habitat protection efforts in the Shiretoko World Heritage Site.

In Japan, the eagles are known as O-washi , and they carry cultural weight beyond their ecological role. For Ainu communities in Hokkaido, the eagle appears in traditional stories as a messenger between worlds. Seeing one remains a marker of good fortune.

The February window is narrow, the conditions brutal, and the eagles declining. But when a 9kg raptor with a 2.5m wingspan drops out of the dawn sky close enough that you hear the wind through its primaries, you're witnessing something that might not last another generation. Track live conditions for this and 590+ phenomena on the Earth Exhibit app: https://earthexhibit.com