Swifts hit new low as poor weather takes its toll

Mass migration back to UK waylaid by stormy conditions and lack of nesting places

The number of swifts that returned to Britain from their wintering grounds in Africa this spring was the lowest since records began, with poor weather in the Mediterranean delaying their arrival by two weeks. Experts fear the recent wet weather will further hit their numbers. Swift numbers in Britain have fallen by more than 50% since 1995.

More than 100 walks, talks and visits to urban areas to witness the swift's aerial "screaming parties" will be held this week to raise awareness of the plight of this unique migratory bird.