The non-profit Assisi Animal Foundation of Crystal Lake is once again offering a leisurely 25-night East African safari timed to coincide with the great migration of animals from Tanzania to Kenya. Starting in Nairobi, Kenya, the expedition visits the paramount safari sites--Ngorongoro Crater, the rich fossil beds of Leakey's Olduvai Gorge, the Serengeti, Lake Manyara and its tree-climbing lions, Tsavo National Park and the Masai Mara, where millions of animals congregate.