why do flies rub their hands together after they land?
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A sense of “cleanliness” (put very, very simply) is pretty universal throughout most of the animal kingdom that is physically capable of cleaning themselves. Even those that dont have the brain capacity to consider clenliness still groom themselves or have a method of shedding themselves as a response to the ever increasing irritation of being eaten alive by tiny things.
For flies… the tiny little mites on them are the size of flies to us, it’d be distracting at best, and possibly interfere with flying in enough numbers. Then theres the fungus and bacteria left over from landing on and eating sewage and rotten meat. Both of which reproduce insanely fast and could literally take over a fly’s brain.
Flies probably don’t care about being clean of course but over hundreds of millions of years the ones that accidentally groomed themselves better lived longer than the poor groomers having a bazillion more fly babies which all got better and better at grooming themselves to the point where we can clearly observe their grooming behaviors.
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