A stag leaps on an ancient brooch. A doe and a fawn step across a field at first light. A pair of antlers is silhouetted by the side of a busy road. From the earliest cave paintings to the present day, humans and deer have a long and complex history. Royal harts were the coveted quarry of European kings, while the first Americans relied on deer for everything from buckskins to arrow heads. Once hunted to the point of extinction in some parts of the...