The Animals of Farthing Wood S01E07 New Friends, Old Enemies
When he is spotted at the lock gate, Fox flees into the town and takes refuge in an alleyway. There, he meets a cat named Tom and agrees to hunt for mice in return for shelter. After hunting, Fox rests in a box which is loaded onto a truck and taken back into the countryside, where he escapes. He meets a friendly horse and takes a rest, only then discovering this area is where a large amount of fox-hunting takes place. Fox bids the horse goodbye, and heads off again, discovering a fox den to rest in. However, a female fox called Vixen returns and allows Fox to stay for a time, then invites him to go hunting.
Meanwhile, after a long debate, the Voles stay behind with the Mice, while the rest of the Farthing Wood animals decide to continue their journey. Soon, Hare sees a shrike carrying a baby mouse and alerts Badger. Hare quickly heads back to the Voles and Field Mice, only to see the baby mice in a grisly scene: killed and brutally impaled on thorns by the shrike. Hare continues on to find the Voles and Field Mice cowering in fear; they agree to rejoin the journey to White Deer Park.

Introduction of Vixen. Death of the Baby Mice.