Humans are the ultimate animals - the most successful species on the planet. Uniquely in the animal kingdom, humans have managed to adapt and thrive in every environment on Earth. Each episode examines one of the extremes of our planet: the arctic, mountains, oceans, jungles, grasslands, deserts, rivers, and even the urban jungle. Each habitat engenders astonishing solutions in the face of extreme adversity. Here are people who survive by building complex, exciting, and often mutually beneficial relationships with their animal neighbors, or the hostile elements of the natural world. This eight-part series is a celebration of the amazing, complex, profound, and sometimes challenging relationship between humankind and nature.