What causes a bird to fly into my window repeatedly with reckless abandon?
I wondered why there was bird poop all over the outside mirrors of my parked car until I noticed a bird fighting his reflection for hours on end. It’s common territorial behaviour. A couple of socks over the mirror solved the problem. A black cutout of a small hawk taped to the window will likely fix your problem.
So the guy who won the Ig Nobel a couple years ago for observing necrophilia in ducks has currently been studying a similar situation in Rotterdam with a single individual bird that has been repeatedly flying into the same window for a couple years now. The guy’s name is Kees Moeliker, you might send him an email. Even as a professional ornithologist, he said he hasn’t figured out why this is happening. It happens year round, clean window or dirty, ornamented or not. The one variation was that he did it less during the season when he was mating or had young, when he was busy with those more productive activities.
