Best Of Natural History Radio

Brett Westwood presents. The Wailing Wall in Jerusalem is the oldest known nesting site in the world for the common swift but numbers are falling there and elsewhere - why and what is being done to help? And Brett discovers more about the private life of the beautiful woodland butterfly the Silver Washed Fritillary. Brett also gets an update on Chris, the Saving Species cuckoo that is making its way to its wintering area in Africa. With news from Kelvin Boot.