Sterna aleutica is a species of . They are found in the indo-malayan realm, The Nearctic, and the palearctic. They are diurnal. They have parental care (pair provides care).
Definition: The largest scale biogeographic division of the earth's surface based on the historic and evolutionary distribution patterns of plants and animals.
Definition: A group of species that exploit the same food resources, and/or use the same feeding or foraging methods. http://en.wikipedia.org/wiki/Guild_(ecology)