This programme explores the extraordinary abilities of Hong, an elephant whose painting skills have rocked the art world and challenged hitherto accepted views on animal intelligence. Can Hong's work pass as art in a top London gallery?

The story of Skamp, a four-year-old schnauzer that is said to have predicted the deaths of 58 residents in an Ohio nursing home over the past three years. The dog appears to alert staff by barking and then stays with the patients until they die.

The unique abilities of Rio the sea lion. Reared in captivity at the Marine Mammal Laboratory in California, the animal developed a strong bond with one of the doctors at the institute. Subsequent research demonstrated the creature performed better in a series of logical tests than some humans

The story of Azy, a 30-year-old orang-utan with incredible mental abilities. Over a number of years, Azy has displayed his intelligence by recognising symbols and objects; demonstrating self-awareness; and showing exceptional memory skills.

Examining a Swedish scientist's attempts to communicate with dolphins, designed to conclusively measure their intellect, and which could save thousands of the mammals from fatal entanglements in fishing nets using a revolutionary computer program based on the creatures' echolocation means of identification.

The story of a remarkable seven-year-old chimpanzee, born in captivity, which has been taught by its mother to recall numerical sequences to a higher standard than human memory champions. In passing a series of computerised tests, the Japanese-raised creature has altered the way scientists think about primates