Butterflies have taste receptors on their feet in order to determine if they've landed on a leaf where they can lay their eggs. If it's edible, their caterpillar babies can eat it when they hatch.

This doesn't mean they only taste with their feet though. They also have taste sensors on the palps on their face, which are like mini-legs, and on their proboscis. Most adult butterflies rely on liquids like nectar to survive, which they eat with their long, coil-able, tube-like proboscis. They also have proteins that detect different tastes like us, like bitter or sweet tastes, and tend to go for sweet tasting things.

Actually, they have taste sensors all over their body! Gustatory Receptors have been found on their antennae, proboscis, maxillary and labial palps, tarsi, wings, and ovipositors. ( https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7687262/ )
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