jimmiec
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House Wrens are aggressive. Male House Wrens start building several nests at once in hopes of persuading a female to mate with him. In this process they will destroy and/or discard the Blue Bird eggs. I manage 10 Blue Bird boxes on my private property and witness this behavior every year.
10:30 AM - May 03, 2023
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In response to jimmiec.
I have seen that too. I built a bluebird condo and stuck it on a post 10 feet above the ground. It seems to help. 2 bluebird families live in it. But the wrens attack all the low robin nests now.
11:54 AM - May 03, 2023
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jimmiec
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In response to jimmiec.
They also destroy the eggs of other House Wrens. Single males compete for females even after a pair has begun nesting. In about half of these contests the outsider succeeds, at which point he usually discards any existing eggs or nestlings and begins a new family with the female. -AAB
10:32 AM - May 03, 2023
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