On 13 May 1975, I observed 2 nests of Larus delawarensis in the Calcite Colony (Rogers City, Presque Isle Co., Mich.) that were unusually close together. The nests had a common rim on one side and both contained eggs. Observations verified that only 2 gulls, apparently a pair, were attending the double nest. The nests were in a portion of the colony that has been used repeatedly since at least 1958.