Many birds wounded, dripping blood as they fly, pus / bacterial infections / maimed / dyng, mostly store owners and bird haters, want to keep birds from defecating on their heads, but out of fear and stress the scared birds defecate even more, so the invention is very innefective, the nails / spikes range from 6 to 10 inches, many birds seen impaired and walking with spikes through their limbs, and very uneducative for our kids and other grown ups, many nail / spike carpets are electrified, firemen were called to remove dangling devises holding by a nail or becoming unglued on high roofs over pedestrians, some electrified wiring seen at main metro station Mont-Royal, with the strenght of wind and weight of snow catastrophy is inevitable, please Mr Couillard, you said you would help, we believe in you, lets not wait untill an accident happens, sincerely peace and thank you