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Scientists studying the human tendency to follow the gaze of other people have found a link to the behaviour of lemurs, a distant primate relative. Psychologists at the University of St Andrews said the action was a practical, food-finding skill, dating back to the time of the first primates. ... Humans find it impossible not to look up when they see someone staring upwards at the sky, even when they know it might be a trick. It's...
 monkey lemur ape gaze primate follow
It is likely communal living was adopted to protect against day time predators.


 social primate animal group human evolution protection