Silhouette of birds of preys also does the trick. I had a friend with one room with windows close to the corner on both sides. For about a month they had a dawn chorus of the suicide run trying to fly through the house.
This was the recommended technique of the time and it worked!
Oh and birds do get it wrong. Working with birds of prey, I have seen numerous one crash into branches, fall off walls etc. The funniest that was a barn owl that didn't want to fly in the wind and accidently fell into a rubbish bin.
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chiming
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Date: 2009-03-05 12:59 pm (UTC)From:This was the recommended technique of the time and it worked!
Oh and birds do get it wrong. Working with birds of prey, I have seen numerous one crash into branches, fall off walls etc. The funniest that was a barn owl that didn't want to fly in the wind and accidently fell into a rubbish bin.