are you sure you mean crows?, if it's trees full it's more likely to be rooks (which are a noisy lot, especially morning and evening). The old adage is, 'if you see a rook it's a crow, if you see crows then they're rooks'.
Probably rooks then, the villagers do have a cull on them occasionally as they are in there thousands, sweeping out of the trees, I'm sure they threaten the livelihood of the songbirds
Yep and for the decline of the songbirds you can blame industrial farming for grubbing up the hedgerows, as many songbirds natrual habitat is in dense cover, open coppiced woodland does them no favours, not the crow, rooks, magpies, grey squirrels. Ideally speaking we shold eat them, same as the rabbits that are prevalent on heathland, farmland golf coursesand motorway embankments but we have become so far removed from nature we can't bring ourselves to make a meal of them.
I'm not having a pop or calling you a townie at all but sadly we have an idelised view of 'the countryside' when practically everything we see has been created by the hand of man.