The volume of overlord butterfly is about three times that of singer butterfly, so it can be inferred that the volume ratio between them is about 27: 1, and the water in animals accounts for the majority, so it can be inferred that the weight ratio between them is also about 27: 1, and the weight of overlord butterfly is about 27 times that of singer butterfly. Roughly calculate the weight of singer butterfly/specimen weight = weight of overlord butterfly/specimen weight of overlord butterfly.