The Sumatran orangutans have been getting used to new quarters, when keepers see that Subis, Tuti, Siska and Indah have gone missing. The keepers must rely on their understanding of the escapees to try to tempt them back inside.
Christmas is approaching. The keepers are hoping to include the animals in the festivities, but not everyone is getting into the Christmas spirit.
Rhino couple Beni and Asha have been kept separate for the last four years while mum Asha has been raising the couple's daughter, Komala. But now Komala is leaving home, and the couple are due to be reunited. Will they rekindle their rhino romance?
Young giraffe mum Tula gives birth, while both the penguin chicks and a silvery gibbon baby must face their fears as they grow up.
A new female chimp arrives at Chester Zoo, the runt of the otter litter goes missing, and cheetah mum Kinky Tail is on the operating table.
A new elephant calf, Indali, is born but her young half-sister Nandita doesn't welcome the new arrival. Plus, bush dog dad Franco is under pressure as his family grows, and Apple, an onager - a very rare type of wild horse - faces a major operation.
Tamsin Greig
Narrator
Olivia Colman
Nick Hornby
Producer
Alistair Pegg
