Mechanical moths were common once: Their metabolism was powered by their antennae, made of the same fine metal mesh that gas lights use.
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For them, it made actual sense to swarm around lights. Gas lamps were a critical food source, leaked just enough to feed a moth for the day.
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When they fell out of fashion, the moths largely died out. Some populations persist in old sewers: Enough metals and swamp gas to survive.
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Turn off your flashlight and sit still: Hear the clickety clack of clockwork wings, see them illuminated by the gentle glow of the antennae.
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You see their larvae eating trails into the handrails. Around the corner, a few dozen cocoons are hanging off an exposed wire, red hot.
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Their insides are reconfiguring themselves, gears are turning and levers moving. (didn't they feed on gas? must have evolved recently)