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Many insects, including Cotinis fruit scarabs (fortunately, my last pet Cotinis is absolutely flightless for some reason), fly to the nearest window or lightbulb when indoors and bang their heads against it until they are quite woozy. I've heard vague mentions of butterflies (but saturniids just beat themselves up) and fruit/flower beetles successfully flying around in big cages from Orin McMonigle's books, but I'm not sure how they work. How do butterfly zoos avoid such a problem, and why does it seem to me that nearly every keeper I've met always keeps their flying roaches and beetles(many winged darklings and ground beetles wouldn't really count as "flyers", because they only tend to fly when dispersing and/or stressed) in flight-restricting small cages? Also, this is a topic for brainstorming some ideas on how to make or improve a flight cage. I know that people have said certain insects, like adult dragonflies, are almost impossible to keep captive, but the insect hobby runs on breakthroughs and discoveries. Having a "freerange" swarm of Cotinis in your living room would be absolutely wonderful if I could make it possible.