Butterflies taste with their feet — not their tongues. In this video, we reveal how microscopic taste sensors (chemoreceptors) on a butterfly's legs read the chemistry of anything they touch in milliseconds: sweet nectar, bitter warnings, and whether a leaf is safe for her babies. You'll learn how a mother butterfly drums her forelegs on a leaf to release its chemical signature before laying eggs, why fussy caterpillars make this test a matter of survival, and what Japanese scientists discovered about the swallowtail butterfly's built-in taste receptor for its host plant.
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