
Ring-billed Gull (Common Gull, Sea Gull)
Kingdom: Animalia, Phylum: Chordata, Class: Aves, Order: Charadriiformes, Family: Laridae, Genus: Larus, Species: L. delawarensis
Family: Laridae (Gulls, Terns, and Skimmers)
- Shape
- Asymmetrical vane, tapered with a rounded tip and a distinctive dark subterminal band and white mirror tip typical of outer gull primaries.
- Size
- Approximately 8 to 10 inches long, consistent with a medium-sized gull primary flight feather.
- Rarity
- Very Common
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Description
A medium-sized gull known for its clean gray back, white underparts, yellow legs, and a distinct black ring around its bill. Highly adaptable and frequently seen soaring near inland waters and coastal areas.
Colour & Pattern
Striking black and white pattern featuring a dark gray-to-black subterminal patch and a prominent pure white tip (mirror), with a pale gray inner vane and a sturdy white rachis.
Barb Structure
Pennaceous vane with tightly interlocked barbs and barbicels along the upper portion, transitioning to slightly looser bases. No afterfeather present.
Texture & Surface
Smooth, firm, and slightly glossy on the dorsal side with a stiffer leading edge to withstand air resistance during flight.
Key Features
White mirror tip preceded by a bold black band on a gray and white primary flight feather.
Habitat
Found near bodies of water including lakes, rivers, coasts, harbors, as well as agricultural fields, parking lots, and landfills.
Geographic Range
Widespread across North America, breeding in the northern US and Canada, and wintering along both coasts, the Gulf of Mexico, and Central America.
Ecological Role
Acts as an opportunistic scavenger and predator, helping to clean up organic waste and regulating aquatic invertebrate and fish populations.
Similar Species
Herring Gull and Bonaparte's Gull, distinguished primarily by overall size and exact patterns of black and white on the primary tips.
Interesting Facts
Ring-billed Gulls are highly intelligent and opportunistic feeders, often seen dropping hard-shelled prey like clams onto pavement to break them open.
Condition Notes
Good condition with minor wear along the trailing edge and slight fraying near the base, indicating a naturally molted feather.