Horizon - Man and science today

'Mama... Papa... cup'-Vicky, the only chimpanzee ever to speak
We humans are so used to being the most intelligent animals on earth that we never really ask why this is. And yet the other animals have also developed intelligence, many of them to a high degree. But none of them comes near to the achievements of even the least educated of men. Is it just a matter of time before they do, or are they stuck permanently one rung below man on the ladder of intelligence? How can men use what intelligence the animals have now?
Tonight's investigation of the intelligence of animals includes pigeons that recognise human faces, squirrels that count, a chimpanzee that talks, and the ever-popular dolphin.
(Colour)