As mentioned here, BBC – Radio 4 will have several shows about Charles Darwin. In Our Time, hosted by Melvyn Bragg, continues with a 4-part series with “The Beagle, the Mockingbird and the Megatherium”:
Part 2 of 4 charts Darwin’s round the world voyage on the Beagle and the objects and the ideas he bought back.
In Our Time’s website is here, and a direct link to the mp3 here.
