Over 80% of the world's chalk streams are right here in the UK, and they are under increasing pressure, especially in Cambridgeshire. Water for Wildlife Officer Ruth Hawksley gives us the lowdown on makes a chalk stream so beautiful, why monitoring river flies can help give them the best chance of recovery, and what we're doing as a Trust to look after these special habitats. We hear from volunteers learning to be the eyes and ears for their local rivers, and why rivers need a whole host of people, projects and organisations to work together for their survival.