Natural history writer, speaker and Natural history writer, speaker and tour leader Dominic Couzens is at the helm this week for Tweet of the Day. For Dominic the impeccably turned out goldfinch is the avian glitterati, bird royalty, star quality on the feeders. Yet it was an encounter with 400 goldfinch feeding on thistle seed heads which captivated Dominic. You can hear more from Dominic in his Tweet of the Week omnibus available on the Radio 4 website or via BBC Sounds. Producer Andrew Dawes