Colourful Behaviour. The conclusion of a series exploring the eye, with a focus on vision, colour perception and the different visual capacities of humans and animals. This week Dr Gillian Rice explores how our mood and behaviour is influenced by colour, the role of colour in communication, and camouflage and advertisement. She examines colour deficiency in humans and explores some fascinating visual tricks and illusions. Producer Sarah Blunt. E-MAIL: scirad@bbc.co.uk WEBSITE: www.bbc.co.uk/nature