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Old 04-22-2009, 12:58 PM
Solfy Solfy is offline
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Join Date: Mar 2007
Location: Pittsburghish
Posts: 1,256
Robins can be aggressive in general. My parents had a crazy robin two years in a row that would not stop dive-bombing its reflection their storm door. It bludgeoned itself repeatedly, day after day, at what it thought was a rival male. In searching for a solution (none of which worked), we learned that it's not uncommon behavior. He gave up after several weeks, but came back the next year for a few weeks. It made a mess of the storm door.

As for the repeat nesting, we've had luck with strategically placed empty coffee cans, as well as one strong bird capable of moving empty coffee cans.