From skateboarding dogs to chimp maths geniuses, Liz Bonnin searches for the planet's most intelligent animals, and John Humphrys puts a goldfish through its paces on Mastermind. Show more
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From skateboarding dogs to chimp maths geniuses, Liz Bonnin searches for the planet's most intelligent animals, and John Humphrys puts a goldfish through its paces on Mastermind. Show more