Why do flies keep rubbing their legs?
excited on what they landed on
That's how some communicate ...vibrations
To release the bacteria present on legs or to clean their legs.
That's how they clean themselves, they don't just rub their legs together, they rub their legs all over their body.
To clean them. They have very small sensor hairs on them, and dust and stuff disturbs the function of the sensors.
I'm sure its just another way for them to be nasty.....FLIES.....eww!!