Researchers at the National Institute of Mathematics and Biological Synthesis of the University of Tennessee (USA) have shown that more than four million years ago the Ardipithecus put aside promiscuity and became faithful individuals to their partners . As the authors explain, the females changed certain rules of coexistence and began to choose less important males in the group hierarchy but capable of bringing food and protection to their offspring. In return, they became his faithful companions. The Ardipithecus were also the first to show signs of recognition between parents and children , as well as the emergence of a new form of society with formulas for cooperation within the group, the scientists clarify in the journal PNAS .
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