Ellie Harrison and her team of wildlife experts explore our precious woodlands and their threatened wildlife. Ellie visits the oak woods of mid-Wales and a bluebell wood in the Chilterns, where she discovers that Britain's woodlands are suffering from centuries of loss and decades of neglect. Iolo Williams champions the native red squirrel, and discovers how we are fighting back against the alien grey squirrel which forces out the reds and gives them a killer disease. Nick Baker tracks down Britain's most venomous animal - the adder - to learn more about its bizarre and secret habits. Gordon Buchanan goes on a Highland quest in search of the near mythical Scottish wildcat. And wildlife gardener Mike Dilger finds out how a school in Portsmouth has transformed part of their playing field into a woodland packed with wildlife. Finally, Ellie takes to the air with a bird which has become one of the greatest conservation success stories ever - the majestic red kite.