Cistothorus palustris
The Marsh Wren (Cistothorus palustris) is a small, energetic songbird, measuring 10-14 cm (4-5.5 in) in length with a wingspan of 12.5-16 cm (5-6.3 in) and weighing 8-12 g (0.3-0.4 oz). Its plumage is olive-brown above, with buffy flanks and a whitish belly, distinguished by a prominent white supercilium and a blackish crown. A key field mark is the distinctive black patch on its back, heavily streaked with white, and its short tail frequently cocked upwards. Taxonomically, it belongs to the ...
Marsh Wrens are obligate wetland dwellers, found primarily in dense freshwater and brackish marshes, preferring tall emergent vegetation such as cattails, bulrushes, and reeds, typically at low elevations.
Their diet consists almost exclusively of small insects and other invertebrates such as beetles, grasshoppers, spiders, caterpillars, damselflies, dragonflies, and flies, which they glean from wetland vegetation.
These diurnal wrens are extremely active, constantly flitting through dense vegetation as they forage. Males are highly territorial and aggressive, often destroying the eggs and young of neighboring Marsh Wrens and other marsh-nesting birds within their defended area, which can span up to an acre...
The Marsh Wren boasts a wide distribution across North America, breeding extensively from southern Canada (including British Columbia, the Prairie Provinces, and the Great Lakes region) south through much of the contiguous United States, primarily west of the Appalachian Mountains. Breeding also ...
Least Concern
- Male Marsh Wrens are prolific builders, constructing up to 20 or more 'dummy' nests, which are used to attract females or as roosting sites. - They are notorious for their aggressive territoriality, often puncturing the eggs of neighboring Marsh Wrens and even other marsh-dwelling bird species....