Re: [SLN] Digest for swiftslocalnetwork@googlegroups.com - 2 updates in 1 topic

[Edward Mayer]

Hi Helen, I just don't see how it can work. The birds cannot see the glass, that's why they fly into it.They never see the glass, it is invisible to them, that's the problem. If you put a silhouette of a Sparrow Hawk on the glass, they see that and get scared and avoid it. But if you put a silhouette of a Swift on it, they see a non-threatening bird and won't avoid it. Where I have seen silhouettes used large scale they are always of raptors, never non-threatening birds. I fear this ill-thought out notion won't work, and may even make things worse. The best solution is something like this  scientifically tested and proven. Best wishes, Edward

On 10/08/2025 07:58, swiftsloc...@googlegroups.com wrote:

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• Swift Silhouettes? Defeating their intended purpose? - 2 Updates

Swift Silhouettes? Defeating their intended purpose?

Edward Mayer <edward...@zen.co.uk>: Aug 09 05:40PM +0100 Logically Swift silhouettes on a glass window will not work as a deterrent to bird/glazing collisions as they show a Swift, a non-threatening type of bird, to other birds, who cannot perceive the glass but can see the silhouette. This means that neither small birds nor predators will be scared off, they will just see a harmless, maybe tasty bird, but not the glass. So, even if they might cause a collision, they are quite pretty and they spread the word. Is that really good enough? Hmmmm!

Helen Lucy <hmll...@gmail.com>: Aug 09 07:28PM +0100 I think it’s an established anti-collision strategy - it shows that there’s glass there, rather than trying to fool birds into thinking it’s the real thing. Even the RSPB offer bird stickers for this purpose.   On Sat, 9 Aug 2025 at 17:40, 'Edward Mayer' via swiftslocalnetwork <

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[Dick Newell]

Has anyone ever gathered data to compare no silhouettes, raptor silhouettes and any other shape of silhouette?

Dick

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[Ann Ellis]

I was advised by someone in the RSPBto draw vertical  lines down my windows with a glass pen

 It seems to have worked as no collisions since i did it a year ago. Does look a bit daft though.  However I don't notice it these days.

Ann