For several weeks crows have been pecking at my front lawn, tearing out the grass and moss. I've just spent two days raking it all off with a wire tine rake and can now see that there are several large patches where all grass has disappeared and the rest looks severely battered. Oddly though, there is a circular area under a crab apple tree about 7m across which is untouched and looking very healthy, and the lawn to the rear of the house is completely untouched. Both lawns are fed and weeded regularly in the growing season though the back lawn, the untouched one, has a bad case of thatch. The front lawn is far healthier and had good growth and colour all of last summer. The guys who do the treatments advised me last year that the larvae of daddy long legs can destroy a lawn by eating the roots and advised treatment which I declined, though his advice was in relation to the back lawn, the untouched one. Crows are quite recent in our garden though magpies have been around for some years. What can I do?