And moving on to a bird-brain side of birds, my brother and sister-in-law have a very nice house on one of the backwater tributary creeks of the Chesapeake Bay, surrounded by many trees and overlooking the waters. One of the regular visitors to a tree right next to the house is a large red cardinal. About once a day or so, this cardinal flies into the sliding glass door and bounces off, luckily so far he has not been seriously injured, except perhaps his brain. He keeps doing this several times a week so apparently there is something he knows that we don't ...maybe his reflection in the glass? Only the shadow knows.
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