Insects can crawl, walk, run, jump, swim and fly. All these movements are brought about by muscles. Crawling takes place without the help of legs. Insects have 3 pairs of legs and their movement is largely confined to them. During walking the fore and hind legs go forward together with the off middle, while the insect remains balanced on a tripod, formed from the other 3 legs and vice versa. Hind legs are also used together for jumping purposes as in grass hopper. Some insects move on the surface of water, some move with their bodies almost submerged but, some insect :Ibelow the surface of water. First group is called the skaters and they w. k supported by the surface tension of the water. The whirligig beetles, which live on Cie surface with only their back exposed, propel themselves by using their submerged legs like oars. The underwater swimmers use their hind legs as oars. Flying insects have 2 pairs of wings; if both pairs are identical, insects can fly slowly. For quick flight, pair of wings is used or both pairs should function as one. Some time one pair is used for flight while the other is reduced to small size or modified for some other purpose as in grasshopper, the narrow force wing is used to hide the bright colour of the hind wing.