House wren eggs1/31/2024 ![]() The oldest known House Wren was nine years old. Young males may take clues from more experienced males about what areas are good nesting sites. Experienced males tend to settle farther apart. Male House Wrens returning north to breed in their first year are more likely to settle close to an established male than farther from it. If a cold snap chills a nest below about 65 degrees Fahrenheit for more than a day it can also doom the eggs. The eggs are glossy white, sometimes tinted with pink or buff. If a sun-drenched nest box warms above about 106 degrees Fahrenheit for an hour, the eggs will begin to die. The average clutch size is 6 to 8 eggs, but up to 12 eggs have been reported. In some areas they are the main source of nest failure for bluebirds, Tree Swallows, Prothonotary Warblers, and chickadees.įor House Wren eggs, temperature inside the nest box can be critical to survival. Wrens will harass and peck at much larger birds, sometimes dragging eggs and young out of a nest site they want - even occasionally killing adult birds. In lab studies, once the spiders hatched, they helped the wrens by devouring the nest parasites.Ī House Wren weighs about as much as two quarters, but it's a fierce competitor for nest holes. ![]() Perhaps to fight this problem, wrens often add spider egg sacs into the materials they build their nests from. As the season progresses their nests can become infested with mites and other parasites that feed on the wren nestlings. House Wrens nest inside tree holes and nest boxes. ![]() A female bird builds a cup-shaped nest with twigs and mud, then makes the interior soft with a layer of dry grass. These eggs have a stunning light blue color. It breeds from Canada through the West Indies and Central America, southward to the southernmost point of South America. A clutch has between three and five, and each robin egg has a length between 1.1 and 1.2 inches and a width of 0.8 inches. The House Wren has one of the largest ranges of any songbird in the New World.
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