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Nest cavities are usually a few meters above ground at most, [21] [22] but occasionally on cliffs as high up as 15 m (49 ft) and more at least in southern populations [verification needed]; they may be natural or man-made, often using bird houses. Northern house wrens are feisty and pugnacious animals considering their tiny size.
The house wren complex has been split into eight species: Northern house wren, Troglodytes aedon; Southern house wren, Troglodytes musculus; Cozumel wren, Troglodytes beani; Kalinago wren, Troglodytes martinicensis; St. Lucia wren, Troglodytes mesoleucus; St. Vincent wren, Troglodytes musicus; Grenada wren, Troglodytes grenadensis; Cobb's wren ...
The size of the nest box also affects the bird species likely to use the box. Very small boxes attract wrens and treecreepers and very large ones may attract ducks and owls. Seasonally removing old nest material and parasites is important if they are to be successfully re-used. The material used in the construction may also be significant.
The riverside wren appears to nest at almost any time of the year. Its nest is globular made of fine fibers; it drapes over a branch to form two chambers with an entrance hole in the outer one. It is often placed over flowing water, 1.5 to 2.2 m (4.9 to 7.2 ft) above it or the ground. The species also constructs "dormitory" nests for roosting.
The southern house wren was formerly considered to be part of the house wren complex that also included the northern house wren and six insular forms. The southern house wren was split from the complex based on the deep genetic divergence, [4] differences in vocalizations [5] [6] and differences in morphology. [7] [8] [9]
Troglodytes [a] is a genus of small passerine birds in the wren family. These wrens are around 11–13 centimetres (4.3–5.1 in) long. They are brownish above and somewhat paler below, with strong legs.