- 3.9–5.5 in
- 0.3–0.5 oz
- Long-billed Marsh Wren
- Troglodyte des Marais (French)
- Chivirín pantanero, Saltapared Pantanero (Spanish)
- Eastern and western populations of the Marsh Wren show slight differences in appearance, but large differences in song. In general, western birds are paler and drabber, and sing less musical songs. The differences may mean that the two forms are separate species.
Nests in variety of marshes, especially with dense reeds.
Insects and spiders.
- Clutch Size
- 3–10 eggs
- Egg Description
- Brown with dark spots.
- Condition at Hatching
- Helpless with only wisps of down.
Domed nest of grasses and sedges with entrance on side, lashed to vegetation.
Actively moves about on or near marsh floor, gleans insects from plants and just below water.
Marsh Wren populations increased between 1966 and 2014, according to the North American Breeding Bird Survey. Partners in Flight estimates a global breeding population of 9 million, with 81% spending some part of the year in the U.S., 18% breeding in Canada, and 38% wintering in Mexico. The species rates a 7 out of 20 on the Continental Concern Score. Marsh Wren is not on the 2014 State of the Birds Watch List.
- Kroodsma, D. E., and J. Verner. 1997. Marsh Wren (Cistothorus palustris). In The Birds of North America, No. 308 (A. Poole and F. Gill, eds.). The Academy of Natural Sciences, Philadelphia, PA, and The American Ornithologists' Union, Washington, D.C.
- North American Bird Conservation Initiative, U.S. Committee. 2014. State of the Birds 2014 Report. U.S. Department of Interior, Washington, DC.
- Partners in Flight. 2012. Species assessment database.
- USGS Patuxent Wildlife Research Center. 2014. North American Breeding Bird Survey 1966–2014 Analysis.