Joyce Faye Stickley, age 12 of Buena or her question.­

Only the most advanced animals can blink their eyelids. The birds and the furry four‑footed animals have movable eyelids made of skin. These eyelids clean and protect the eye and when necessary they shut out the light. Fishes and snakes have transparent unmovable eyelids, These fellows have a fixed, unblinking stare. In the insect world, we find large button eyes called compound eyes. A compound eye is made from countless small lenses, each catching a picture of the scenery.

The fly has five eyes, none of them fitted with eyelids, The two large buttons are compound eyes, Between them he has three small simple eyes, each one able to catch only one picture of the scenery.