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This is something actually elaborated upon by movie staff (I believe even the director?). The Light Fury is a subspecies of the Night Fury. In short, this means that their evolutionary path began with the Night Fury, like a dog's began with a wolf's. To find it in simple terms, "A subspecies is a category in biological classification that ranks immediately below a species" (ex: leopard vs African leopard). This means that they are genetically compatible and can produce offspring (in most, if not all cases), such as the NightLights.
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