gonochoric/gonochoristic/dioecious (sexes separate).They preferring cavities closer to the ground with small entrances. House Wrens nest in tree cavities, such as old woodpecker holes. House Wrens are able to breed (have reached sexual maturity) when they are 1 year old, but some first time breeders skip the regular breeding time and choose instead to breed alongside the older birds who are attempting a second clutch in a season. Hatching begins about 12 days after the last egg is laid and occurs only during daylight hours. Females develop single large incubation patches (bare areas of skin on their bellies) and will spend over half of their time incubating the eggs, once their entire clutch has been laid. House Wren nest sizes range from 4 to 8 eggs, with one egg laid per day. These animals are found in the following types of habitat.In Mexico, they prefer tropical evergreen and semideciduous forests. During the winter wrens live in thickets, shrubby and brushy areas, riparian forests, and savannas in the southern United States. Human farming and towns have created more good breeding habitat for the wren by fragmenting forests, which explains why the House Wren has expanded its range and numbers in North America. Small wood-lots and forest edges are also well known habitats for these birds. However, they were named for their preference for small town and suburban backyards and human-made bird houses. In the wild House Wrens live in open, shrubby woodlands. They spend the winter in a narrower range the southern limits of the United States, southwestern California east to Florida and south throughout the Gulf Coast and Mexico. During the breeding season they live from southern Canada to southern Argentina, Chile and the Falkland Islands. House Wrens are native to the Nearctic region. They are usually 11 to 13 cm long and weigh between 10 and 12 g. There is a faint, white stripe above their eyebrows. Some black, dark brown, or pinkish spots appear on their flanks, tails, and wings. Their heads, napes, and backs are almost uniformly brown with their throats and chests a uniform light grey. They have long, curved bills and are seen perching in the "wren posture" with the tail held up. House Wrens are small, squat birds that lack bold or characteristic markings.
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