BBC News - Science & Environment: AUDIO: 'No way of telling' weasel numbers

BBC News - Science & Environment The latest stories from the Science & Environment section of the BBC News web site.

AUDIO: 'No way of telling' weasel numbers Dec 2nd 2011, 08:00 Marina Pacheco of the Mammal Society says mustelids "could be going extinct without us knowing" or "could be thriving"

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