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Butterflies feed on live young to steal chemicals for good sex

The toxic seduction secrets of the milkweed butterfly – and a new word for stealing chemicals.  

A buterfly on a leaf. It has yellow and black wings. It has a long protuding tongue that is embedded in the belly of a blue and black caterpillar
Milkweed butterfly drinking caterpillar juices. Credit: Kai Tea.
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