I have a cardinal that has beat himself to near death by attacking the side mirror on my truck and also the house in general. This goes on the entire day. I assume he sees an intruder in his territory. This has gone on since Feb 1. I had the same thing up north with robins.
Up north I have birds that have flown into our sliding glass doors. About half the time they break their necks. I think they "see" a flyway but don't see the glass.
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