Esther Rantzen reports on 24 hours in the life of London Zoo. This small corner of Regent's Park has become a treasure trove of some of the world's rarest animals. Each day there are moments of comedy and drama while vets and keepers struggle to keep exotic creatures alive and happy. A rare antelope is injured, an orphan chimp needs bottle-feeding, behind the scenes scientists breed test-tube marmosets and a giraffe is parcelled up for a long journey.

Tonight's film follows the animals' private lives, as well as their public ones, from dawn to night-fall.