A BBC survey of animal cognition, built around problem-solving experiments filmed with species chosen for their brainpower rather than their fame. New Caledonian crows bend wire into hooks to fish food out of tubes, chimpanzees work out multi-step puzzles for a reward, and elephants show the kind of cooperative behavior that suggests planning rather than instinct. Dolphins and other marine mammals get their own segment, tested on memory and social learning in both open water and controlled settings. The film moves between field footage, shot in the animals' natural habitats, and staged trials designed by researchers to isolate a single skill at a time, whether that is tool use, self-recognition, or working with another animal to reach a goal neither could manage alone. Scientists explain what each test is actually measuring and why the results keep pushing the boundary of what counts as intelligence. The cumulative case is that animal minds are more calculating, and more like ours, than the old instinct-only picture allowed.