From our kitchen windows we spot them, nibbling away at our gardens and shrubs. They wander along our highways, reminders of the wilderness we have paved our way through. From coast to coast some 30 million white-tailed deer make their home in the United States. But once they retreat from our view, where do they go? What secrets do they carry back into the forest, away from our prying eyes? Deer are among the most highly-studied mammals in the world; but does any typical homeowner with deer in the yard know how long a deer can live? When they sleep? How many babies a doe can have each year? Working with scientists, special camera equipment, and deer experts and devotees of every kind, NATURE reveals the hidden world of white-tailed deer in a whole new light.