Wytham Woods, is reputedly, the most studied woodland in World. Marc Brouard is the latest in a long line of scientific researchers to undertake field studies on small mammals. In 1943 Charles Elton, known as 'the father of modern ecology', studied wood mice and bank voles and his work was followed up by H.N. Southern who examined the impact of predation by tawny owls on populations of small mammals. Marc aims to understand how the characteristics of individual wood mice and bank voles can affect the survival of each species.