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All bugs bodies have three main parts: head, thorax (main body) and abdomen (tail).   All muscles and appendages (wings and legs) needed for flying are attached to the thorax of each bug.  
       

The two main ways that bugs fly are called indirect and direct flight. The difference between these is how the bugs' muscles move.

In indirect flight, the bugs' flight muscles are not attached to the wing, but to the thorax. When these bugs contract (tighten) the muscles in their thorax, their wings go up.

In direct flight, the bugs' flight muscles are attached to their wings. When they contract (tighten) their flight muscles, their wings go down. When they relax their flight muscles, their wings go up.

  
       
    Bugs start to fly with a little hop, and then they can take off flying.    
         
People who study bugs are called entomologists.       Bugs don't breathe through their mouth or nose like people. Instead, they have small holes along their thorax and abdomen. These holes, called spiricles, bring fresh air into the bug.
    There are more bugs than people on earth. In fact, for every one person on this planet, there are more than 10,000,000 bugs!!!