Now look here you birdies, this year I don't want to see any scruffy old nests in my trees. Last year they were littered with twiggy, grassy, mossy, monstrosities that made the whole place look like a tip.
This year I want you all to confine your squalor to the insides of the neat little bird boxes that I've painstakingly provided; AND, I'd be grateful, when visitors arrive, if you'd all try to make sure that your feathers are clean, tidy, and correctly in place.
From now on, this will be a tidy bird zone; I shall even leave a receptacle for your old discarded egg shells.
Any bird found making the place look like a junk yard, will be plucked, imprisoned, banished, or all three.
p.s. Those making well camouflaged nests (in Leylandii hedge, etc) will be exempt from the above punishments; there will also be prizes for 'best-kept nesting boxes', 'cutest brood of fledglings', and 'most melodic singing'.