That’s very frustrating. But it was a dead bluebird that first drew me to becoming the Bluebird Nut I am today. Don’t give up. You might be able to get the little devil using a VanErt trap in the box, and just hanging out for a little while near the box – parked in your car or something. Disposing of the culprit would be the best thing you could do for that poor dead mama bird.
Central NY
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