Whether it's how they look or the way they behave, the world is full of super cute animals. This heartwarming programme reveals the science that explains why they look so endearing. Find out why the charming snoring sound a hummingbird makes when it sleeps is so important to its survival. Sea otters might look like big bundles of fluff, but find out why they're really so furry. The penguin's waddle looks very funny, but the programme reveals the reasons for this comic walk. Featuring locations from around the world, contributions from scientists, user-generated content and Natural History Unit archive, this fascinating programme reveals the science behind that 'aah' moment.