Chris Packham explores the minds of the cleverest animals on the planet, discovering the astonishing abilities of the best, and most unlikely, animal problem-solvers on the planet, crows. He witnesses a remarkable world first as they solve the most complicated animal-puzzle ever completed. And he uncovers the extraordinary range of animal intelligence: bees which navigate, cockatoos which pick locks and a brilliantly ingenious octopus.

• Jacqui Smith

• Chris Packham