"Peaceable Kingdom" by John Banovich

"East Africa possesses one of the last great wildlife concentrations on earth. In the Serengeti region, over one million wild beasts migrate from the south, north to the Masai Mara in Kenya, and back again- in pursuit of rich nutritious grass following the rains.
Predators, including lions, benefit as well during this time as prey numbers regionally increase ten-fold during these times the wildebeest can tell if the lions are in hunting mode or not and behave accordingly often coming very close to investigate. Although when the sun finally sets, the lions will become active again in the pursuit of the great herds under the cloak of darkness." John Banovich