

The Birds · Plate CXIX
Ring-billed Gull
Larus delawarensis
Laridae · Taxon 4364
| Length | 43–54 cm (16.9–21.3 in) |
| Wingspan | 105–117 cm (41.3–46.1 in) |
| Weight | 300–700 g (10.6–24.7 oz) |
Field marks
- Short yellow bill encircled by a narrow black ring
- White head, neck, underparts, and tail in adults
- Pale silver-gray back and upperwings
- Black wingtips marked with small white spots
- Pale eye and yellow to yellow-green legs
- Long, slender wings extending beyond the square-tipped tail when perched
HabitatFreshwater lakes, ponds, rivers, reservoirs, estuaries, beaches, mudflats, and other open shorelines; also common in agricultural, suburban, and urban open spaces.
BehaviorA social, opportunistic omnivore that forages on foot, while swimming, and in flight; it scavenges, snatches food from the water or air, and nests colonially on the ground.
Palette