Think for a moment, now, that in an animal brain, there is no conscious thought, only reaction. It is a processing of information. Animal behavior changes based upon different reactions, hence different processes. Turtles which reacted by sensing which direction the ocean is and moving towards it tended to survive with a higher frequency. So over time, only the turtles which processed the surrounding information in this such way at that moment in their life remained.
Now ask yourself, "Why are people innately afraid of the dark?"
English
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Because beyond the tribal campfire and even before that, beyond the communal huddle, the dark is where the leopards and bears and wolves are waiting.
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Precisely ^^ Those in our ancient ancestral chain, who may have even been pre-human, were selected against braving the dark. I'll give you 4 scenarios: -Brave safe -Brave monster -Scared safe -Scared Monster In both instances of the "Scaredey Cat", the being will live because of a 0 chance of encountering the monster. Half of the "Heroes" who brave the dark encounter the monster and cease to exist. Thus, being afraid of the dark arises.