Invasive signal crayfish, shags, night-shining clouds

This week in the Planet Earth Podcast - Richard Hollingham finds out why the American signal crayfish is driving out one of the UK's native species; in our latest audio diary...
14 March 2012
Presented by Richard Hollingham, Sue Nelson

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This week in the Planet Earth Podcast: Richard Hollingham finds out why the American signal crayfish is driving out one of the UK's native species; in our latest audio diary, Hannah Grist from the University of Aberdeen talks us through her research on European shags; and what noctilucent clouds tell us about our changing climate.

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