I have had mine out a couple of times (just the hens as I find the cocks have their mind on other things at this time of year and are more interested in fighting and chasing on the roof and are vunerable) prior to pairing. Have to keep them tight so they will come straight in as the sparrowhawks here are shocking. The trouble is that they get worse end of February and March is a complete nightmare. I have seen 3 sparrowhawks today one cock and two hens and that was without even trying. In the past if I stayed out when the birds were out they would be ok. All change now though, even if the birds are picking around my feet the sparrowhawks still attack them. You can chase them and they are back within 5 mins. They are the single biggest problem that I have to face. I get peregrines regularly but they dont cause as much grief to me as the sparrowhawks.