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Because in the past we were ALL flies. :D LOOL Well, I don't believe in these blunders. ;)

I think that the richness of ecological niches for flies is very appealing and the fact that there is SO MUCH to know about them turns the field of dipterology so interesting. And thinking of flies like fabulous evolution's machines and the fact that they are here even before the human being landed. ;)
But, really I don?t know why this inclination for dipters appears... it is a mystery.