Ring-billed Gull
Larus delawarensis · Lifer #25
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Photos: 5 Forms: 2 (Breeding, Non-breeding)
CA-BCUS-DCUS-DEUS-ILUS-VA
Monotypic. Plumage varies, breeding (FEB-AUG) has more white in head/nape, while non-breeding (SEP-FEB) has grey mixed in. M/F similar.