Brian Briggs, former singer, lyricist, and guitarist with the band Stornoway, takes over the Tweet of the Day output this week. Brian who has had a lifelong passion for the natural world and birding, even completed a PhD on ducks. Stornoway, who's third album Bronxie (the colloquial name for the arctic skua) finally disbanded in 2017, allowing Brian to convert his hobby and long standing love affair with birds into a career. He is now is the reserve manager of the Wetlands and Wildlife Trust's Llanelli Wetland Centre. With a lifetime of bird knowledge, Brian recalls the other-worldly sound of Manx Shearwaters, calling from their burrows on the island of Skomer in west Wales, the largest known concentration of these birds in the world. You can hear more from Brian in the Tweet of the Week Omnibus, available on the Radio 4 website and on BBC Sounds Producer Andrew Dawes