Eurasian red squirrels have an innate appeal and are one of our most popular mammal species. They live in forests, share our parks and gardens and mesmerise us with their cute, captivating and endearing behaviour. The current volume offers an up-to-date overview of all aspects of red squirrel biology together with an extensive bibliography of published books, articles and research papers. The detailed and illustrated chapters provide a window into the hidden life of red squirrels and their fascinating ecology, population dynamics and behaviour. The book integrates material, research findings and images from across the red squirrel's Eurasian range, with particular attention being given to conservation efforts, favourable forest management options and the threat posed by the Eastern gray squirrel (also referred to as 'grey squirrel' in Europe). The latter has been responsible for devastating population declines of native red squirrels in the UK, Ireland and Italy and is likely to invade Switzerland and France in the near future.