insects
A butterfly lands on a juicy piece of fruit, and before it even unrolls its curly straw-like tongue, it already knows if the fruit tastes sweet.
Butterflies have taste sensors located on their feet, so the instant they land on a flower or piece of fruit, they can already detect whether it's sweet and worth eating. Only after confirming something tastes good do they uncurl their long, straw-like tongue, called a proboscis, to actually sip up the liquid.
A butterfly's wings are used for flying and display, not tasting, and while its antennae play an important role in smelling and sensing the air around it, taste specifically is handled by receptors on the feet rather than the antennae alone.
This foot-tasting ability is especially useful for female butterflies, who use it to check whether a leaf is the right type of plant before laying their eggs on it.
insects
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