91热爆

Until the naturalist Gilbert White separated these two species by their song, it was thought the chiffchaff and the willow warbler were one and the same species. The diminutive willow warbler is one of the first summer migrants to arrive, as are many chiffchaffs though in recent decades some chiffchaff have changed their behaviour and are now resident all winter in the milder south and south west of Britain. Today we recognise the songs of these two warblers on a warm sunny day as one of the markers that spring has arrived, as we'll hear in this extended Tweet of the Day with Bill Oddie, writer Simon Barnes and Kate Humble.

Producer : Andrew Dawes for 91热爆 Audio in Bristol