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Glowing animal eyes can be eerie, but also quite interesting if we try to determine whose eyes are there shining back at us.  

Many animals who are out at night have reflective material behind their eyes' retinas, which make their eyes appear to glow when hit by a flashlight or vehicle's headlights.  The color of the reflection, or whether or not there even is a reflection, depends on the species.

Raccoons, deer, dogs, cats, and horses produce these reflections, while humans, other primates, and pigs do not have eyes that glow at night.

The substance behind the retinas influences the glo...