This pugnacious little wren, formerly known as the Long-billed marsh wren, inhabits cattail, bulrush, and other marsh plants. As the only Oregon species of wren that nests over water, it is easy to identify when seen, but sexes are difficult to differentiate in the absence of song due to similar coloration.

This species has long been of interest to behavioral and evolutionary ecologists due to its polygyneous mating system, widespread construction of dummy nests, and the male's complex singing behavior.

The Marsh wren nests statewide in appropriate wetland habitats. It is particularly common during breeding season around Malheur National Wildlife Reserve. Less common breeding populations are found along the Columbia River and in the Willamette Valley, in coastal estuaries and in southern Oregon coastal river valleys.

Hear the song of the Marsh wren

Photo by Cathy Nowak, ODFW