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Nest site characteristics were studied in five Audouin's Gull (Larus audouinii) colonies breeding on small rocky islands in the Aegean Sea, eastern Mediterranean. Although rocks and vegetation constituted the habitat of Audouin's Gulls, there were many intercolony differences in the use of these habitat features, especially those related to vegetation. Discriminant Function Analysis (DFA) indicated that vegetation parameters effectively identified habitat variables at nests. Different habitat variables discriminated between nest and random quadrats in three colonies. Percent rock cover around nests varied. The gulls nested relatively far from the available protruding rocks without a tendency to nest near rock crevices and, in two colonies, rock height had no relation with nest placement. In two of three of the colonies, gulls nested farther from vegetation, in lower vegetation, and in one colony percent vegetation cover at …