19:30Stories in SoundFifty Tails of GreyBBC Radio Ulster Duration: 30 minutes Thu 10th Mar 2016, 19:30 on BBC Radio UlsterAvailable for over a yearListen nowA look at red squirrels and the threat they face from the introduction of the grey squirrel into their habitat. Could the elusive pine marten help save them?GenresFactualFormatsDocumentariesBrandStories in Sound Source: BBC Online