Common truth can be considered the fact that all flies are an annoying hindrance to the person. Not only that they publish unpleasant hum, so also importunately creep on a body, and live in doubtful places – congestions of human excrements. Moreover, flies are messengers of pathogenic microorganisms which can become a cause of death of the person in general.
Probably, many people noticed strange feature for flies: when they sit down on something, by all means begin to perform a certain operation - they rub the friend about the friend the lobbies and back pads. To find out why they make similar manipulations, it is worth addressing chemistry and zoology.
Why flies rub a pad about a pad?Flies is quite clean insects, though unpleasant on the essence. They rub the pads far not just like that. They clean them. In principle, this rather logical explanation. At any opportunity the fly who temporarily sat down on something directs to herself purity as if a cat. She "washes": back and front pads the friend about the friend rubs, corrects and wipes to himself wings. But business here not so much in sincere desire from a fly to be clean, how many in her animal instinct and need. In other words, cleaning of pads and wings are not a tribute of cleanliness, but vital need. The fact is that on tips of mushiny pads there are special small small pillows which are called pulvilla. They are covered with microscopic hairs. From these bristles the fly emits the special sticky liquid similar to fat. Actually sticky secret represents mix of fats and carbohydrates. This substance, thanks to the viscous structure, allows an insect to keep without problems even on the most smooth surfaces. Certainly that to sticky mushiny pads small parts of dirt and other garbage of which it is necessary to get rid immediately it here in the simple way will stick. Flies fly everywhere therefore their pads very quickly become soiled, losing the stickiness. From all aforesaid it is possible to draw the following conclusion: it is impossible to call flies to pain clean insects, cleaning of the pads is simply necessary for them. Otherwise it will be very difficult for flies to move on surfaces, including on mirrors, glasses and ceilings.
Interesting about flies
Not so long ago scientists made discovery concerning flies. On their pads special bodies of touch and taste were found. It appears, flies distinguish taste of food not a proboscis, but legs! It became known that mushiny legs not only do not concede in it to human language, but also surpass it several times. There is an opinion that "aggradation" of pads is an also peculiar artificial improvement of the perception of taste.