Nature is a wildlife documentary program that has been airing on PBS since 1982. Its longevity is explained partly by its quality; Nature has won numerous Emmy awards. Documentaries have explored a multitude of different animals, plants, and other aspects of the natural world. Subjects vary from "Africa" to "Yellowstone Otters". Some documentaries have featured celebrities, such as "Wild Horses of Mongolia with Julia Roberts" and "John Denver: Let This Be a Voice." While the documentaries vary in creator, style and narrator, they are all educational and suitable for the entire family.