African grey parrots have outperformed two-year-old humans in intelligence tests
Who's a brainy boy then? African grey parrots not only learn to talk, but outperform human two-year-olds in a test of intelligent reasoning.
No other animals apart from great apes match the birds' ability to understand noise-related causal connections, say scientists.
Human children only do as well as the parrots from about the age of three.