i have to stick by what is proven and i bet you any money that where the owl is in bristol it still has its fare share of sparrow hawks ,its all stories and tales like you say .i just wish it was true it would save me a lot of time and effort and money ,and would be the answer to all our problems when it comes to BOP ,but sadly it is not, the ivemetamin [you would have to put that much on a pigeon to do any good , that it would kill the pigeon] ,or the same hawk would have to eat a lot of pigeons with it on to kill it .if you dont belive ,then go and see a vet that knows what he is talking about ,all these things that we hope will sort the hawk problem are always fought by the RSPB [JUST IN CASE IT MIGHT HAVE SOME EFFECT ON THE BOP ]not because it will just like a lot of other products are band for the same reason.ATB les.