A crocodile waits just off the banks of the Mara River, and knowing that the wildebeests will eventually cross the river, is eager for a meal

crocodile wildlife grazing herd serengeti migration grazer tanzania river wildebeest reptiles herbivore scavenger predator prey crossing africa safari carnivore gnu scavenge water dangerous kenya danger ecology wild nature climate masai survival mara east death grass risk global life fittest game sun drive