Writer and naturalist Paul Evans meets Prof Lynn Margulis, whose study of the Earth's smallest creatures led to a revolutionary theory for all life on Earth. Show more

Writer and naturalist Paul Evans goes to Maine to meet David Evers, a conservation biologist who has spent a life with loons, the enigmatic bird of northern lakes. Show more

Writer and naturalist Paul Evans goes to the Highlands of Scotland to meet Roy Dennis OBE, statesman of British conservation, who has spent a life with ospreys. Show more