I'm more used to seeing the larval stage of this fly - they live underwater and camouflage themselves by sticking tiny stones or bits of twig to their bodies so they do look very comical. I used to catch them as a child and keep them in an aquarium so I could watch them better. They are close relatives of moths and butterflies but they have tiny hairs on their wings rather than scales. Strangely I don't remember seeing an adult before!
Lovely image
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