Are you sure that's also true of Rooks, Marches Farmer? I have to say I haven't seen any of them bothering the lambs yet, just stealing their food.
I could shoot them if I wanted to, and whilst that might stop them from visiting our fields, I doubt I would be able to make any real dent in their numbers (need a ladder trap for that I think). That's the reason for the question really - if they're not doing any harm, I'll let them be.
As for the food question [member=42855]waterbuffalofarmer[/member] , we have several pet lambs in a field on their own, so we have been giving them a bit of creep just because really! I read you get more yield by kg by creep feeding when young, rather than old, but as with all things smallholding, I'm happy to be corrected!