Writer, filmmaker and co-founder of bird song recognition app Warblr Florence Wilkinson has early memories of watching wildlife and being woken by her parents to hear tawny owls. But in this Tweet of the Day she discusses why the siskin has been chosen, not the brightly coloured male, but the female which Florence thinks of as subtly nuanced in colour, rather than drab as some people would say. 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.