The aerial sample count survey of Jonglei ecosystem was carried out during March 2010. 397 individual elephants were observed during the sampling exercise but the elephant population estimates were not derived and therefore the elephant count was submitted as an informed guess.
Source:Grossmann, F., Elkan, P., Tiba, C., Moi, J., Awol, P.P., Lita, J., Demetry, P. and Kenyi, S. (2011). 'Aerial Survey of Wildlife, Livestock and Human Activity in and around existing and proposed protected areas of the Republic of South Sudan 2009 - 2010'. South Sudan: Wildlife Conservation Society and Ministry of Wildlife Conservation and Tourism of the Government of South Sudan