http://www.cotf.edu/ete/modules/msese/earthsysflr/savannah.html
http://www.blueplanetbiomes.org/savanna.htm
http://www.nceas.ucsb.edu/nceas-web/kids/biomes/savanna.htm
http://www.zoomwhales.com/biomes/savanna/savanna.shtml
http://www.summitelgin.org/grassland_web/Tropical%20Grasslands/Introduction.html