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Larus delawarensis
A medium-sized, white-headed gull, the Ring-billed Gull appears similar to the Herring and California Gulls, but is smaller, with a shorter bill that has a broad, black ring around it. The Ring-billed Gull is slightly larger and bulkier than the Mew Gull. The white body and tail, slate-gray back and wings, and black wingtips with large, white spots (windows), typical of most gulls, are all present on the Ring-billed Gull. The juvenile is mottled brown mixed with adult plumage characteristics. It has pink legs and a pink bill with a dark tip. As the bird matures, the legs turn yellow, and the bill becomes yellow with a black ring. The adult's eye is also yellow. The adult in non-breeding plumage has brown streaking on its head. The Ring-billed Gull takes three years to reach maturity.
Breeding: breeds North America common (May–August); colonial or in scattered pairs on coastal islands, islands in lakes, on buildings. Since late 1980s has bred in Louisiana,
Hi Richard! This is a nice series indeed. Welcome to Project Noah! You have a great start to your spottings.
I agree with Liam. These are Ring-billed Gulls. Here is another reference:
http://www.allaboutbirds.org/guide/Ring-...
1st winter bird in first and third shots, nonbreeding adult in the second. Herring are noticeably larger with stouter bills.