In this report, the author defines the kind of big wild mammals to four species—Japanese bear (Ursus thibetanus japonicas), antelope (Capricornis crispus), deer (Cervs nippon) and wild boar (Sus scrofa). As the distribution of the first two species is very limited in Kyushu, the author's interest here is inclined to the distribution of the latter two animals. Thus his major problem is why the deer defenseless against the attack of mankind have been keeping greater territory—though the territory is separated in some pieces—than that of the much stouter wild boar. The major premeise the author has taken here is that, in the densely populated land as in the western part of Japan, the distribution of these large-sized wild mammals are the result of suffering defeat from mankind. In short, the reason of this distribution can be sought, not in natural but in historical factors. This is well-ascertained by documentary records written by some old Japanese herbarists and geographers. Also, the author's data, including these documents, consist of hearings from native hunters, information from investigaters and guide-books, and of his own observations. One of the most valuable resources is the stone monuments which are established by native hunters who hunted one thousand beasts. This custom is prevalent only in the northern part of Kyushu. The dates of these monuments show indirectly the definite dates of the extinct species in their vicinities—the interval of both dates is about half a century in each case. The general distribution of the big wild mammals in the Northern Kyushu, except its northwestern islands and peninsula (Nagasaki Prefecture), is given in Fig, 1. Since the bigining of the 17th Century, the large-sized, wild mammals have been driven out from the middle part of the Northern Kyushu where lie the Chikugo Plain and the Seburi Hills, to the north-west and to the south-east, In the northwestern part there are no bear nor antelope but deer and wild boar merely living in some cape-heads or isolated islands. On the south-eastern part there is a mountainland of bear and antelope, named Sobo-katamuki Range. This is the unique territory in Kyushu District where the four animals are living together. Int the same regions there are other deer territories which have no wild boar—e. g. Hikosan mountains and Kunisaki Peninsula. By more integrated research in Kunisaki Peninsula and Sobo-katamuki Range, the author has found that the selected attack of mankind to those mammals should not be neglected. For instance, the bears have been kept safely by the belief that who kills a bear must be haunted by its ghost even to postery, which has been kept till now at the foot of Sobo-Katamuki Range. On the other hand, since Meiji Era, the wild boar has been hunted more and more in many regions, because his meat began to have been tasted common since that time. Nevertheless this is a inferior condition than the ecological and topographical one, which has kept them from attack of mankind. For example, the author observes that the deer lives on steeper and savanna-like hillsides than the wild boar does, the latter of which preferes to gentle and dark bushed hills. And the latter runs slower than slower than the first, and always walks along the fixed tracks of his own, so then the native hunters skillfully follow and mark them when they hunt. On the contry, the deer climbs steeper hillside very rapidly and rushes into shrub fields for every way when he is attacked. Thus the mountainous and virgin forests are the advantageous places for them—e. g. Fukaba (Kumamoto Pref.), Kurodake (Oita Pref.) and the Sobo-Katamuki Range kept a number of deer or wild boars, only bacause in such location their enemy could hardly act quickly enough to get them.