Robert, Nature will find a way of balancing things out. Lots of magpies one year mean less songbird chicks next year, so, less food for magpie chicks= less magpies the year after and more songbirds. I know you have to do it--I couldn't stand back and see birds starve during the winter any more than the next person but this does alter the balance. More songbirds come through the winter etc. etc. etc.
Whose to say a magpie is less precious than a robin? Or a sparrowhawk less than a bluetit?
Hawks, especially have no other source of food---no Tesco in the tree tops
