On this week's BBC Radio 4 travel programme "Excess Baggage", John McCarthy talks to Mark Carwardine. The program is available for streaming online for 7 days, but also as an MP3 podcast.

Zoologist and conservationist Mark Carwardine talks to John McCarthy about his life travelling to film, photograph and write about creatures which inhabit the deepest oceans or the dustiest plains. In 1990 he went in search of animals nearing extinction with Douglas Adams and more recently with Stephen Fry and, as an occasional leader of wildlife expeditions, he shares his thoughts on the ethics of animal tourism, ecology and the environment.