For writer, filmmaker and co-founder of the bird song recognition app Warblr Florence Wilkinson, the brown thrasher, as the state bird of Georgia in the United States, is a apt choice as she recalls how her citizen science inspired project is being used to help schoolchildren recognise birdsong in North America and elsewhere. You can here more from Florence and her work in the accompanying Tweet of the Week podcast, via the Radio 4 website. Producer : Sarah Addezio.