By Sadie Shields
Along the wind-lashed shoreline of Humboldt County, where gray Pacific swells roll toward rocky headlands and fog drapes the coastline, flocks of dark sea ducks rise and fall with the rhythm of the ocean. Among them, the surf scoter is unmistakable. The male, with its bold white head patches and brightly patterned bill standing out against its otherwise black plumage. Moving bravely through the salty breaking waves, this dark-as-night sea duck is one of the many signs of winter’s presence along Northern California’s coast.
In Humboldt County, surf scoters are most commonly found during the fall, winter and early spring. They gather in large numbers along the open coast and in protected waters such as Humboldt Bay and the Arcata Marsh. Preferred habitats include shallow marine environments, such as bays, estuaries and nearshore surf zones, where they can dive for food. Their diet consists mainly of mollusks like mussels and clams, along with crustaceans. These birds are strong divers, often plunging several meters below the surface — even in rough surf, to reach prey on the ocean floor.
Surf scoters are migratory birds; they do not breed in Humboldt County, but instead travel long distances to nest. During late spring and summer, they migrate north to freshwater lakes and wetlands in Alaska and Northern Canada, particularly in boreal forest regions. There, they build nests on the ground near water. As temperatures drop in the fall, they migrate south again to coastal wintering areas like those in Humboldt County. This seasonal migration is a well-documented and essential part of their life cycle.
Physically, the surf scoter is a medium-sized sea duck, measuring about 17 to 21 inches in length, with a wingspan of approximately 29 to 30 inches. In size, it is comparable to or slightly larger than a mallard, though more heavily built. Its compact wings are adapted for fast, direct flight during migration, while its dense body and strong legs make it highly efficient underwater.
In terms of lifespan, surf scoters can live over a decade in the wild. Banding records indicate that individuals may reach at least 12 years of age, though numbers are likely lower due to natural mortality factors such as predation, pollution and climate change.
Unlike some bird species, there are no widely recognized or documented local legends or traditional myths in Humboldt County specifically centered on the surf scoter. However, coastal residents and birdwatchers often view their seasonal arrival as a sign of winter. Their presence in large offshore flocks is a familiar and reliable feature of the region’s colder months and contributes to the ecological character of the coastline, which means they will be moving soon for their migration.
The surf scoter is a highly adapted marine bird whose migratory patterns connect Humboldt County to distant northern ecosystems. Its seasonal presence highlights the importance of healthy coastal habitats and offers a striking example of how wildlife depends on multiple regions across a vast geographic range — and even the Humboldt cold.
Sadie is a junior communications major, journalism minor at Cal Poly Humboldt who has an interest in covering and taking photos for sports and wildlife journalism, and a slight interest in breaking news. She can be reached at sls331@humboldt.edu.