I am investigating how fruit flies combine their senses of vision and smell to find food. It has been shown that flies can only locate hidden odour sources when there are certain patterns on the walls around them, so their navigation must rely on vision. My objective is to understand the neural mechanisms behind this behaviour. I shall use a variety of techniques, such as tracking the flight paths of flies (including ones with neural mutations), and testing models using computer simulations and robots. This work has applications in the design of unmanned air vehicles, as well as being relevant to the more general problem of building robots with multiple ‘senses’.