3/3. Grass: Series exploring East Africa's Great Rift Valley. On the savannah grazers and predators struggle to dominate, forcing primates to form social systems. Also in HD. [AD,S]
2/3. Water: The Great Rift Valley channels a huge diversity of waterways - rivers, lakes, waterfalls, caustic springs and coral seas - spanning from Egypt to Mozambique. Also in HD. [AD,S]
1/3. Fire: Volcanic peaks soaring above the scorching plains of East Africa create cool islands of habitat where strange creatures have evolved in splendid isolation. Also in HD. [AD,S]