Eight programmes on the changing face of zoos and wildlife parks.
3: The Techno Zoo
A$10 million hothouse and a $7 million fridge show the extent to which some zoos go to make their inmates feel at home.
Jeremy Cherfas looks at penguins on ice beneath the Californian sun, and gorillas and orang-utans swinging in the steamy heat of Chicago's Tropic World in the depths of winter.
Vending machines for lizards and showers for pigs are just some of the technological tricks that zoos have devised to provide animals with something to do and the visitors something to watch. Producer GEORGE INGER BBC Bristol