The Gambella National Park was established primarily to protect two species of endangered wetland antelopes: the White-eared kob and the Nile Lechwe. Other wildlife reported as living here include populations of elephant, African Buffalo, lion, roan antelope, tiang, Lelwel Hartebeest, olive baboon, and Guereza monkey. Several birds only found in this area include the shoebill stork, the Uelle Paradise Whydah and the Red-throated and Green Bee-eaters. In Gambela Region Aguak and Nuer ethnic groups are dominant.