Coastal beaches, tidal flats, reefs, islands, marshes, estuaries, and lagoons. Nests mostly found on ledges of vertical rocky cliffs in the vicinity of seabird colonies; some nests on grassy benches of rocky bluffs (NatureServe 2006).
NatureServe. 2006. NatureServe Explorer: An online encyclopedia of life. Version 5.0. NatureServe, Arlington, VA. Available http://www.natureserve.org/explorer.