Nightjar is a bird of the dead leaf design with size of a dove. It comes as a summer bird in Japan and almost inhabit the whole area from the level ground to the subalpine zone. It is nocturnal and am active until the daybreak from the evening. It arrest the insects such as moths while it open a mouth greatly, and flying and it goes down on the ground and hunt for bait at night. It add a stomach to the wide skill of the tree and it is parallel and stops and is absent in the daytime. The figure looks at a glance like the lump of the tree. It lays two eggs generally on the direct ground and do incubation without making a nest. Because the design of the body is protective coloration, it cannot tell the two apart via the side.