The term itself is derived from the Arawak word for ‘treeless lands having grasses’. Likewise, savanna ecosystems where summers are wet and winters are dry are listed under the temperate ecoregions. They are meant for migrating over longer distances at times of prolonged drought spells and similar unfavorable climatic conditions. There are savanna's located in Africa, South America, India, and Australia. Copyright © Science Struck & Buzzle.com, Inc.