Fight or flee? Resist or surrender? Aggression is widespread in animals. However, risking injury is the last resort. Presented by Sir David Attenborough. Show more

David Attenborough examines how recognising friends and respecting the power of rivals is vital. Show more

David Attenborough looks at how animals form partnerships. Birds rid larger animals of itchy hangers-on, hermit crabs enlist stinging anemones to repel octopuses. Show more

Chris and Jordan help a family with triplets start cooking from scratch, so that they will waste less food and be able to save money. Show more

Guest Shark Peter Jones hears pitches on a tool for cleaning quickly and easily, a healthier version of a favourite indulgence and a stylish men's apparel line. Show more

An entrepreneur from Spokane, Washington, pitches his portable solution to enjoying beverages on tap and taking the party wherever one goes. Show more

With guest Shark Peter Jones. The Sharks are presented with a customised song service, a work-from-home idea that increases productivity and a mail-order meal service. Show more