David Tennant's new documentary, Pets Wild At Heart, begins on BBC One tonight at 8pm.
About tonight's episode:
First of a two-part documentary using innovative techniques to reveal the secrets of pets' behaviour, including why hamsters love to run in a wheel, how dogs pick up the rules of the pack and how kittens learn to be solitary hunters. Featuring views of plunge-diving dogs, babysitting cats, acrobatic hamsters and a playful cat outwitted by his prey. The latest science also reveals why budgies talk, how a cat scales a vertical wall with the help of a special claw, why hamsters stuff their faces with more food than they can eat and the real meaning behind a rabbit's hop. Plus the free-roaming pet dogs of Cusco Peru, pet rabbits living in a natural warren and the wild-living inhabitants of Cat Island, Japan. Moving X-rays, thermal imagery, minicam-carrying dogs and slow-motion photography show why pets play and how their true wild nature is just a whisker away.
Pets Wild At Heart, 8pm BBC One