A vast expanse of flat savannah grasses stretching from horizon to horizon, broken only by an occasional gnarled acacia and rocky kopje, the Serengeti has some of the highest wildlife concentrations in the whole of Africa. Year round it is one of the best safari holiday destinations to see the "big five"; elephant, rhino, lion, leopard and buffalo, whilst the central Seronera area of the Serengeti has one of the continent's densest populations of the elusive leopard. The short grasses on the Serengeti plains makes it easier to see many of the smaller animals that are always present in the African bush but seldom observed. Fascinating creatures such as aardwolf, porcupines, badgers, jackals, mongooses, meerkats and pangolins can all be sighted. Adding to the resident wildlife is the annual migration of the wildebeest. Their journey starts in December in the southern Serengeti and finally leaves the northern Serengeti in early August, heading into Kenya. Vast numbers of zebra, giraffe, buffalo, eland and gazelle species also get caught up in the wildebeest throng. Keeping them company is a travelling band of predators and scavengers taking full advantage of the extra food on offer.