Marshes, ponds, lakes, swamps, especially with emergent vegetation (Sibley and Monroe 1990), and marine bays, inlets, and harbors (Campbell et al. 1990); in migration also rivers and brackish coastal areas (Sibley and Monroe 1990). Nests on islands in lakes or on banks of small pools; nest is hidden in reeds or under bushes close to water or in tuft of grass on slope (Terres 1980).
Campbell, R. W., N. K. Dawe, I. McTaggart-Cowan, J. M. Cooper, G. W. Kaiser, and M. C. E. McNall. 1990. The Birds of British Columbia. Vol. 1 and 2, Nonpasserines. UBC Press, Vancouver, B.C.
Sibley, C.G., and B.L. Monroe, Jr. 1990. Distribution and taxonomy of birds of the world. Yale University Press, New Haven, CT. xxiv + 1111 pp.
Terres, J. K. 1980. The Audubon Society encyclopedia of North American birds. Alfred A. Knopf, New York, NY.