The Burrowers, BBC Two, 9pm Friday 15th August.
Alice stand aside! Chris Packham enters a specially built rabbit hole to explore the real wonderland of burrowing British mammals, including badgers, voles, rabbits and moles.
Photo: BBC
The team were able to capture intimate views of family life for some of Britain's best loved, and least understood, species. The resulting footage revealed previously unknown insights: from where water voles locate their latrines to how unrelated badgers establish social bonds.
In the past, underground filming has been limited by natural conditions. The lack of light forced filmmakers to use infra-red cameras that only produced black and white footage, for example. The claustrophobic nature of underground dwellings also makes it difficult to follow animals without disturbing them.
The filmmakers overcame these challenges by consulting with zoo architects, model makers and experts in underground species, then building artificial burrows based on those found in the wild
Read more here and see cute photos of animals asleep in their burrows here