Fortunately our sparrowhawk didn't turn up during the RSPB Birdwatch. The birds can cope with lazy well-fed cats but not with this killer.
I had a problem with flocks of starlings in my Douglas Fir and it was the Sparrowhawk that eventually drove them away.Believe me it is not a problem you would wan't,they left 5 barrowfulls of muck after only 3 weeks,so you can see I was glad to see the back of them.