The bluebirds arrived in early March and set up house keeping in one of the bird houses in my front yard. The wrens arrived about 2 weeks ago. Last week when I mowed lawn I found the bluebird eggs scattered around the nest box.
Well, needless to say, the wrens have taken over that nest. Just yesterday the bluebirds started nest building in the second bird house. What are the chances the wrens will leave them alone? For the past 2 years a pair of chickadees successfully fought off the wrens, but it appears that the bluebirds are less aggressive.

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