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Lepidopteran insects like butterflies and moths use diverse strategies to gather liquid nutrients. In addition to sucking nectar from flowers, some butterflies take in water and nutrients such as salts and amino acids from substrates like wet soil, dung, and carrion. In many species, only the males engage in mud-puddling, but they pass nutrients to females during mating, increasing their odds of reproductive success. Some butterflies draw nutrients from blood, tears, and what other substances? Discuss
Source: The Free Dictionary