<P> Carolina wrens are both genetically and socially monogamous and will usually mate for life . Mate changing is rare, and there has been one possible observation of polygamy . During the winter season, males are more responsible for guarding the territory . Females vary in succeeding to maintain winter territories without a mate . It has been suggested that the possibility of desertion and decline in care - taking from males along with the need for security in resources year - round prevent extra pair copulations from females, as the mortality rate for Carolina wrens peaks during the winter . Along with thermoregulatory benefits, roosting is thought to reinforce pair - bonding and prevent divorce between mates . </P> <P> The nests are arch - shaped structures with a side entrance and built of dried plants or strips of bark, as well as horsehair, string, wool and snake sloughs . Males obtain nesting materials while the females remains at the site to construct the nest . Nests are located in fragmented or complete cavities in trees, or in man - made structures such as bird - boxes, buildings, tin cans, mailboxes or unorthodox places such as pockets of hanging jackets in sheds or in a tractor in everyday use . Nests are from 1--3 m (3.3--9.8 ft) from the ground and are rarely higher . They occasionally can be built in sloping locations or at ground level . </P> <P> Egg laying dates and clutch size vary by region; in Texas the time period is from late February to late August, in Iowa it ranges from late April to June . The clutch size is generally 3 to 6 eggs, but can reach as high as seven in Texas . The eggs are creamy white with brown or reddish - brown spots, and are more heavily marked at the broad end . The eggs are incubated by the female for 12--16 days . After the young hatch, they are fed exclusively on invertebrates and they fledge in 12--14 days . As many as three broods may be raised by a pair in a single breeding season . In one study, three of the 70 fledglings remained or defended territory adjacent to the natal area . </P> <P> Male and females are involved in the process of provisioning at similar rates throughout most nest stages, with the males providing slightly more in the nestling stages . Both sexes increase their provision rates as the nestlings grow in age . </P>

How long for carolina wren eggs to hatch