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I'm not sure I'd call them instinctual. Theyre more just naturally things that we tend to fear. I dunno if theyre built in. Fear of the dark is being uncomfortable loosing our primary ranged sense. I never remember being actually afraid of the dark, uncomfortable sometimes, yes.
Falling itself is uncomfortable, all our liquids inside move suddenly to a new position. It messes up your vestibular system (primary balance system). Fear of heights? Not everyone has that fear.
Fear of reptiles has already been covered, I remember having a pet iguana when I was really young and never remember being afraid of them. Never had a problem with snakes until I learned that some are venomous.
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