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Ring-billed Gull
Primary flight feather (Remiges); specifically, one of the Outer Primaries (likely P9 or P10)

Ring-billed Gull

Kingdom: Animalia, Phylum: Chordata, Class: Aves, Order: Charadriiformes, Family: Laridae, Genus: Larus, Species: Larus delawarensis

Family: Laridae (Gulls, Terns, and Skimmers)

Shape
Highly asymmetrical with a very narrow outer vane and a broad inner vane; includes a distinct notch/emargination on the inner vane near the tip for aerodynamics.
Size
Estimated 4-5 inches (10-13 cm) in length, consistent with the outer primary of a medium-sized gull.
Rarity
Very Common; one of the most widespread and frequently encountered gulls in North America.
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Description

This feather belongs to the Ring-billed Gull, a medium-sized gull with a white head and body, gray back, and yellow legs. The species is named for the prominent black ring near the tip of its heavy yellow bill.

Colour & Pattern

Bicolor pattern; the distal (top) half is dark brownish-black/charcoal with a tiny white tip appearing worn; the proximal (bottom) half is clean white. This 'dipped in ink' look is classic for many gulls.

Barb Structure

Densely interlocked pennaceous barbs throughout the majority of the vane for flight rigidity; small plumulaceous section at the very base near the calamus.

Texture & Surface

Smooth, stiff, and glossy; the leading edge is very rigid to withstand high wind pressure during flight.

Key Features

Sharp contrast between white base and black tip; extreme asymmetry of the vanes; characteristic 'notched' shape of the inner vane near the tip.

Habitat

Highly adaptable: found near lakes, rivers, coasts, parking lots, landfills, and agricultural fields.

Geographic Range

Widespread across North America; breeds in Canada and northern US, winters south to the Gulf Coast and Mexico.

Ecological Role

Generalist predator and scavenger; helps clean up carrion and waste, but can also impact smaller shorebird populations through nest predation.

Similar Species

California Gull (larger, similar pattern but longer feather), Herring Gull (much larger), or Mew Gull (smaller, different black/white ratio).

Interesting Facts

Despite being called 'sea gulls,' many Ring-billed Gulls live their entire lives far inland near freshwater or urban centers. They are master scavengers.

Condition Notes

Good to Fair condition. The tip shows some 'feather wear' or abrasion common in gulls that forage on the ground; the barbs are mostly intact.