Presenter Dermot O'Leary relishes soaring swifts and swallows bobbing in front of his car.
Writer, gardener and TV presenter Monty Don recalls the summer swallow in Tweet of the Day
Grant Sonnex presents the programme from the RSPB's reserve at Minsmere in Suffolk.
Swift flies the skimming swallow: Brett Westwood on a much-loved seasonal-indicator bird.
Brett Westwood presents the story and sound of the swallow.
Kate Humble presents the swallow.
Sarah Angliss uncovers the fascinating story of how we tried to teach the birds to sing.
Angela Saini explores the science of birdsong and its relationship to human language.