Andrew Sachs meets an African grey parrot that talks and behaves like a precocious child, a macaw that turns on the central heating, and a cockatoo that trashed its owner's kitchen. Colourful, sociable and extremely intelligent, parrots have captured our imagination - but is their behaviour evidence of real intelligence, and what are the implications of plans to re-establish endangered varieties in the wild?

(Repeated from yesterday 9pm)