Elizabeth Barrette (ysabetwordsmith) wrote,
Elizabeth Barrette
ysabetwordsmith

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Visual Evolution

 ... drives the shape of pupils.  Don't put the wrong kind on your aliens or fantasy species.  How do you know the right kind?

1) If they're similar to a Terran species, just keep the same basic features.  So a catlike alien would tend to have vertical slits.  This is helpful if you want to use some of the really weird shapes.

2) If they're not similar to a single species, look for parallel evolution.  Were their ancestors predators (vertical slits), prey (horizontal slits) or active foragers (round)?

3) If they have a totally different shape, make sure you provide an explanation that makes sense.  Frex, hourglass pupils might have a separate rod/cone mix, so that each half would dominate under different lighting conditions.
Tags: how to, nature, news, reading, science
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