NAIROBI, July 26, 2016 (Xinhua) -- Gnus swim across the Mara River at the Maasai Mara National Reserve, Kenya, July 14, 2016. The Maasai Marra 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)
