why do flies always rub their front legs?
451703
They're plotting against you...\nJust kidding, They taste through their feet so it probably has something to with tasting.
786419
During the summer and autumn/fall, many fly species lay eggs in plants and things. The eggs hatch, and the larvae stay in the plant for the winter, developing into adults. In the spring they leave the plant and find a mate, and the cycle starts all over again.\n\nSome flies do not need to mate to reproduce, and their offspring are 'clones' of the mother. This is a very quick way of producing offspring, so the population increases very quickly when it becomes warm again.\n\nThe black flies you saw were probably lying dormant in some nooks and crannies somewhere. When the temperature drops, their body processes slow down and they 'hibernate'. When the temperature rises they become active again. Thats probably where you blackflies came from
567291
It's because it makes their fur stick to them and they hate the feeling of it. It has to do with the way the fur mats up. I am not sure why!
349260
They are a disgusting type of fly.  You usually see them joined end to end during "love bug" season and they are everywhere!  Your windshield gets plastered with them.  We were in Florida one time during the height of love bug season (September)...never again!  I am not aware of any purpose they have unless it is irritating people.\n\nFor more info and to see what they look like:\nhttp://insects.tamu.edu/extension/bulletins/uc/uc-009.html\nhttp://www.floridaenvironment.com/programs/fe00508.htm
763266
Most insects -- and that is the case of flies -- have internal fetilization, so they do mate.
731322
Here's a thought....\n\nAfter Mr. Fly is tired out from a day's work of swarming around and eating from trash bins, dog poop and road kill, he buzzes on over to your house and takes a rest on your kitchen counter - right where you make your PB 'n J.  He visits various other spots in your house - including your shoulder - before finally landing on your ceiling, where you end his life with a swat and thus disperse his microbe-ridden remains throughout your living room.\n\nYet as filthy and annoying as the fly is, I'll take the occasional dirty rogue fly over the persistent cockroach infestation any day of the week.
686226
Because eventually your legs fall off. \n\nJust warning you...
613959
because when they bite you, a long tube goes into your skin. that's when they suck up blood. at the same time, they inject poison. mosquitoes need blood to fertilize their eggs
1140476
they hide in places you never look in.  flies, like many other bugs, are active during daytime when it is warm. at night, when it is cool, they rest in sheltered areas like under the roof, in pipes, on the walls.  moths and other night bugs do the opposite.
606435
Because you smell the tastiest.\n\nEver wonder why the mosquitoes bite you and not the guy next to you? They are attracted to certain chemicals in the carbon dioxide being released from your body and the guy next to you doesn't have as much of these chemicals in his carbon dioxide as you do. However, there are thousands of chemicals already identified in human carbon dioxide release! What are these certain chemicals that attract mosquitoes? Have they been identified? Yes! but the scientists who discovered them aren't telling us exactly what they are! That’s right they are keeping these facts a secret! All they will say is that three key chemical signatures found in the release of human carbon dioxide will attract mosquitoes at a rate of 100%.
1069503
Well they are definatly one of the worst disease carrying insects on the planet. Actually the deadliest insect, or animal for that matter is the mosquito (Culicidae), which is a fly (order Diptera). House flies do have and act as the vector for several diseases, this has to do mostly with the way in which they feed. The fly mouthpart or haustelum is used for lapping up food, it has no functioning mandibles for chewing. The fly's favorite food as an adult is many forms of sugar. In order to dissolve sugar, a liquid must be added, and due to fly's limited resources, it uses its own saliva to dissolve the sugar particles. This regurgitation is how many of the common zoonotic infections are spread by this seemingly harmless insect
440213
That is because the fly IS moving at the speed at which the vehicle is moving. By the way, it DOES NOT hover at the same place. Suppose the fly is a little fast than the car , then it appears to the fly that the wind-shield is moving towards it and it then adjusts it's speed to remain in the same place( if it chooses to). In the same way in all other cases, it modifies it's speed.\n Someone above pointed to inertia. Remember inertia only acts if the fly or any other object is in contact with the moving object. Otherwise it does'nt come into picture.
10796
Mosquitoes are attracted to the heat, humidity, and carbon dioxide that mammals emit. When they bite, some of their saliva is absorbed into the bite. Our body reacts to the "infection" and creates the bump and itch.  Calamine lotion is the best defense. Place it on the bump and it absorbs to relieve the itch.
334289
I assume you mean a fly in the car with you.\n\nThe reason is inertia.  You, the car, the fly, and all of the air in the car share the same inertia, which means relative to each other, you are motionless.  Open a window, and inertia and air pressure differentials will circulate air through the car, and hopefully suck the little bugger out so you can drive in peace.
721240
Because they like the feeling of cloth rubbing on their butt hole.  I spend the whole day trying to keep that outta there, why in the heck would I put it there on purpose?!?!?!
511978
I think it may have something to do with blood types. My dad and I get bitten all the time, we have A type, yet the flies don't touch my mom, who has type O.
313377
seen a video to the end - the fly indeed doesnt fly upside down , it just flies close to ceiling, then sticks its front legs in front of itself and "palms up" to touch the ceiling above head, then go the second and then third pairs of legs so the fly sits on the ceiling with head facing the oposite direction than when it was flying. \n\nJust as if it wanted to land on a wall , only it flips 180degrees and not just 90