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Strictly speaking, yes. But one does not always have the means to collect the larvae and bring them to a place where you can rear them. Neither do all larvae act kindly to the attempts to rear them, as they can be very picky to the conditions they are kept it (too moist, too dry, airing, etc.) or don't like the food you may supply (if you can find it). And then again, some may need a diapause of some kind of which we know too little to get them though it alive.