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Ring-billed Gull nesting colonies normally include a small percentage of female couples. Fertilized by a male, each female of the couple lays a clutch of eggs, leading to 5–7-egg "superclutches." In this year's Central Park Bird Count, 267 Red-billed Gulls were found.

Ring-billed Gull nesting colonies normally include a small % of female couples. Fertilized by a male, each female of the couple lays a clutch of eggs, leading to "superclutches." often the most common & widespread gull in NA, especially inland