The interactive zones are shown in three rounded rectangles. We will discuss these topics under the following three main titles. In present theories of hominisation the ecological distinction of arboreal and terrestrial domains of locomotion is crucial. Both types of space form a climatically conditioned transitional environment with specific implications for locomotion, food control and social behaviour. Most anthropologists today agree that this transitional environmental background provided the stage for hominisation processes in Africa.
Sociobiology is fixed on the toolmaker concept.
First, from a constructive point of view. The tree nest is part of the tree in which it is built. It gains its stability naturally from the tree. In contrast to this, the ground nest introduces entirely new parameters which are evident, if we look at it as a construction. Rooted materials are used, e.g. bamboo stalks in a bamboo grove.