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 The pupil is the dark small center circle in our eyes. The pupil is actually a hole that lets light into the eye so that we can see. Light changes the size of the pupil. When it is bright and light is strong, the pupil gets smaller. When it is dark, the pupil gets bigger to let in more light. In other animals, the pupil can be a different shape. Cats and Werecats have vertical slit pupils as do snakes, Swamp Monsters, Dragons and Gorgons.  Here's the iris. The colorful circle around our pupil connects to muscles in the eye. These muscles control the pupil and can make it bigger or smaller. The iris is responsible for making the muscles let light into the pupil when it is dark and keep light out of the pupil when it is bright.  The sclera is the white part of the eye. While Humans and Cyclops have white scleras, other mammals are different. In dogs, cats and other mammals the part of the sclera we can see matches the iris, so it looks like they have no sclera at all. These ghouls have white scleras, colorful irises and vertical slit pupils:
Eye color tends to run in families. Every member of the wolf family has yellow irises!
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