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Milkweed butterflies tear open caterpillars and drink them alive

Not all caterpillars grow up to be beautiful butterflies. Some become living milkshakes for their dads, who guzzle caterpillar body fluids to attract the ladies.

Recently, scientists reported the first evidence of butterflies sipping from the bodies of caterpillars — dead and alive. They observed adult milkweed butterflies in North Sulawesi, Indonesia, using tiny claws on their feet to scratch wounds in caterpillars’ bodies so they could lap the liquid that oozed out. 

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