Trueor false? An ostrich’s eye is bigger than its brain. T at’s true. Hamsters only blink one eye at a


time. T at’s also true. Animals need their eyes. Eyes help animals see the world around them.


Eyes come in many sizes, shapes, and colors. Yet they


all do the same job. T ey catch light. With help from the brain, eyes turn light into sight.


EYES IN ACTION


Eyes can look different, but often they work the same way. Most eyes have a pupil and an iris.


human eye pupil fish eye iris


iris 18 NATIONAL GEOGRAPHIC EXPLORER


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