The sweet chirruping of birds as they flitter about the garden of a Sunday morning surely ranks as one of the loveliest natural pleasures out there. Trouble is, everyone who's got a garden seems to have a birdhouse to entice their birds into their own garden. If you haven't already got one, then what's the one sure-fire way of convincing the neighbourhood thrushes that your garden is the place to be? Make an effort with your birdhouse, of course!