NAIROBI, July 26, 2016 (Xinhua) -- Crocodiles are seen on the bank of Mara River at the Maasai Mara National Reserve, Kenya, July 14, 2016. The Maasai Mara National Reserve, popularly known as Africa's Greatest Wildlife Reserve, is a great tourist attraction center as it offers visitors an opportunity to observe the Africa's "big five": lion, cheetah, elephant, buffalo and rhino. (Xinhua/Meng Tao)