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American Robin nest with cowbird egg?

This from last year...stumbled onto this when I was on the ladder pruning the pear tree. About a week later the nest was destroyed by something. I was just wondering...since Robin and Cowbird are similar in size they would all grow up together...have you witnessed this? I have seen cowbird egg in chipping sparrow nest before also and I would think the much larger cowbird would eventually push the others out?

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