House Wren
House Wrens nest inside tree holes and nest boxes. As the season progresses their nests can become infested with mites and other parasites that feed on the wren nestlings. Perhaps to fight this problem, wrens often add spider egg sacs into the materials they build their nests from. Once the spiders hatch, they help the wrens by devouring the nest parasites.
The House Wren has one of the largest ranges of any songbird in the New World. It breeds in Canada through the West Indies and Central America, southward to the southernmost point of South America.
Though a House Wren weighs only as much as two quarters, it is a fierce competitor for nest holes.
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.
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