Why do some bugs have more than two eyes?

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Have you ever learned about bugs’ eyes? If so, then you might already know that not all of them have just two eyes – some have even more!

In some cases, a bug (like a fly) who appears to have just two eyes actually has what’s known as “compound eyes.” A bug’s compound eyes don’t work like ours. If you guessed from the name, compound eyes are sort of like many little eyes grouped together! Each compound eye is made up of facets, which are like individual lenses. Some bugs have compound eyes made up of tens of thousands of lens-like facets! Certain bugs (like types of mayflies) can even have two pairs of compound eyes. Having these special eyes lets bugs spot movement and motion even faster than we can with our eyes. And because they’re so good at recognizing motion, it also lets them fly super fast without accidentally hitting anything!

Sometimes, bugs also have what’s known as “simple eyes.” (Scientists call them “ocelli.”) Simple eyes are mostly used to detect light, and because they aren’t very strong on their own, bugs often have multiple simple eyes, which are able to help the bug get a better picture of its surroundings by working together!

Seeing double!

If you had more than one pair of eyes, what are some things you think it might help you with? Where would you want to have the extra set or two? On the back of your head? The top of your head? Maybe you’d want extra eyes on your knees!

What are some things that might be difficult about having extra eyes on the back of your head or the bend in your knees? Can you think of any reason why you wouldn’t actually want to have any more eyes than you already do? Do you think that humans have just one set of eyes for a reason??