House wren.


 Lots of activity at the wren house these days. I think they are on their second nesting.

Rondeau Provincial Park, Ontario, Canada, July 1, 2024.

Troglodytes aedon. 

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. In lab studies, once the spiders hatched, they helped the wrens by devouring the nest parasites.

source - allaboutbirds.org

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