The genus Drosophila is one of the great success stories. There's hundreds of species within the genus. They're on every continent except Antarctica, they're in tropical rain forests, they're in deserts, they've evolved many exotic mating behaviors, and they're capable of incredibly long-distance flights.
There is a reference in Aristotle to a gnat produced by larvae engendered in the slime of vinegar. This must have been Drosophila.
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