simple ,you wont get rid of them all but you can put a big hole in the numbers [if every one got of their *expletive removed* and atleast tried ,there was 3 in my area now i dont see 1 ,also 6 sparrow hawks they have gone except for 1 and it is going to join the others ,along with the odd remaining goss that i have seen on the odd ocasion flying over ] just a matter of time ,fore two years i could not let my birds fly around the loft ,i had to risk taking them training 2 times a day to get them fit ,then i decided enough was enough and came up with a soloution ,and keept using it ,with very good results .ATB les.