Migrating swifts loyally return every year to nests in buildings, study finds

Conservationists emphasise importance of protecting nesting sites used by ‘strongly faithful’ red-listed speciesMigratory swifts loyally return every year to their nests in buildings, according to a study, underlining the importance of providing the endangered birds with hollow nesting bricks if traditional nest sites are lost to renovations.The swift, which is on the red list of conservation concern, is one of Britain’s most threatened species, having declined in number by 70%