Some of Britain's best-loved songbirds are underthreat. Gavin Hewitt
investigates the decline in numbers of some species, and asks how we can avert the prospect of a countryside without the sounds of spring. Seetoday's choices. Producer Yvonne Ellis ; Executive producer Peter Crawford The Natural HistoryProgramme this Friday at 11.30am on Radio 4 considers the effect of pesticides i n our gardens
* When did you last hearthese birds?: page 26