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...source material from inside the BBC through BBC Motion Gallery and Worldwide. And people from inside the BBC ask me to source material from outside the BBC. But for most part they both want the same thing, which as you say is the behaviour of the animals. That is one of the driving things about the NHU that it makes, the fact is it says, ‘this animal does this thing, we...

...Open University Transcript Stories of Change project Richard Tol Interview Key RH: = Roger Harrabin interviewer RT: = Richard Tol, Economist, participant RH: Richard Tol, thank you very much for coming in to talk to the Open University and to Radio 4 Documentaries. RT: Thanks for having me. RH: We're starting all our interviews in this series with a question: when did you...

...opening for the digestive and urinogenital systems - that is also present in non-mammals such as lizards. Hedgehogs eat earthworms, slugs, eggs and frogs, in addition to insects. They, of course, are considerably larger than shrews and cannot always hide in undergrowth when foraging, so their niche is not quite the same as that of shrews. DA refers to hedgehogs...

...source of all variation, is mutation. A mutation is an alteration in the genetic material which is copied from parent to offspring - the DNA in the cells of an organism. Such an alteration may be associated with a change in the appearance or behaviour of an individual carrying it. For example, there might be a mutant male guppy that has no spots at all, or one that has an...