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Biology of "peak" and "late" nesting Ring-billed gulls, Granite Island, Lake Superior
Late-nesting Ring-billed Gulls in this study laid fewer and smaller eggs and hatched fewer young than earlier nesting pairs. Birds nesting late in the season appeared to lack sufficient stimuli for incubation, as indicated ...
Behaviour and reproductive success of female-female pairs of Ring-billed gulls (Larus delawarenis), Granite Island
Female-female pairs of Ring-billed Gulls were studied on Granite Island, northern Lake Superior, during the breeding seasons of 1979 and 1980. In 1979 the colony consisted of approximately 2400 pairs with 99 nests (4.1%) ...