All over Britain, there is a secret army of dedicated people. They spend millions of hours watching over our wildlife. In the first of this six-part series, mammal watchers come under the spotlight. Mammal enthusiasts have to be truly dedicated, because most of our furry creatures are extremely difficult to see. Many are elusive and fast moving, so it takes real skill just to find them. We go into the rafters of a haunted mansion to spot bats, into the depths of a wood to discover a sleepy dormouse, stand out in the pouring rain to catch a glimpse of a brown hare - and for the elusive otter, our poor naturalist has to be content with its poo.

Britain has a long tradition of amateur naturalists taking to the wilds to pursue their passions. Due to them, we have the best-known wildlife of any country on Earth. Our mammal watchers are playing their part, each providing unique information about their beloved animal. Show less