A baby boom among Britain's blue tits could cause an avian housing crisis in 2005, according to wildlife experts. The British Trust for Ornithology (BTO) is urging people to put up nesting boxes to help the birds this spring. Data collected for the trust's Ringing Scheme, showed 2004 was a productive year for blue tits, many of whom will now be looking for their first homes. But natural nest sites, such as holes in trees and buildings, vanish as woods are tidied and houses are repaired. Nest Box Week Once a bird has found a place to nest it may...