Western Gull
Kingdom: Animalia, Phylum: Chordata, Class: Aves, Order: Charadriiformes, Family: Laridae, Genus: Larus, Species: Larus occidentalis
Family: Laridae (Gulls, Terns, and Skimmers)
- Shape
- Highly asymmetrical vane characteristic of primary flight feathers; the leading edge (outer vane) is significantly narrower than the trailing edge (inner vane). The tip is rounded, and the overall outline is elongated and slightly tapered.
- Size
- 26 cm (approx. 10.2 inches). This is consistent with a primary flight feather of a large gull; typical Western Gull primaries range between 22-28 cm depending on the specific position on the wing.
- Rarity
- Common; they are the most abundant and ubiquitous large gull along the California coast.
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Description
This is a primary flight feather from a Western Gull, a heavy-bodied gull with a bulbous-tipped yellow bill. Adults are distinguished by their dark gray 'mantle' (back and wings) which contrasts sharply with their snowy white head and underparts. They have pink legs and a fierce expression due to their deep-set eyes.
Colour & Pattern
Solid slate-gray to charcoal-gray on the vanes, typical of the dark mantle of a mature Western Gull. There is no white apical spot visible at the tip, which suggests it may be a slightly worn feather or from a sub-adult nearing maturity. The ventral side is lighter silvery-gray.
Barb Structure
Densely interlocked pennaceous structure throughout the main vane for flight aerodynamic integrity. The base features a prominent plumulaceous (downy) section that is bright white, aiding in insulation.
Texture & Surface
Smooth and stiff to the touch. The surface has a slight matte-to-satin finish, typical of seabirds that require water-resistant plumage maintained by preen oils.
Key Features
Uniform dark slate-gray coloration without mottling; thick, white rachis base; significant asymmetry; and the specific 26 cm length which narrows the possibilities to the larger Larus species.
Habitat
Coastal environments including rocky shores, sandy beaches, estuaries, and offshore islands. They are rarely found far inland, unlike other gull species.
Geographic Range
Resident year-round along the Pacific Coast of North America, from Washington state down to Baja California. The California Central Coast is the heart of their range.
Ecological Role
Apex scavenger and predator in coastal ecosystems. They help clean up beaches but also regulate populations of other seabirds by preying on eggs and chicks.
Similar Species
California Gull (smaller, lighter gray), Glaucous-winged Gull (lighter, silvery-gray wingtips), and Heermann's Gull (much smaller and darker). The dark mantle of the Western Gull is its most defining trait among West Coast gulls.
Interesting Facts
Western Gulls are incredibly long-lived, often reaching over 25 years in the wild. They are also known for 'kleptoparasitism'—stealing food from other birds—and are the top avian predator in many Pacific nesting colonies.
Condition Notes
Good to Excellent. The vanes are largely intact with very little fraying at the edges. The calamus (quill) is clear, suggesting a natural molt rather than a forced removal.
Notes
california central coast. the feather is 26 centimeters from end of quill to tip