[Answer] Why do butterflies stand on their food?

Step 1 : Introduction to the question "Why do butterflies stand on their food?"

...Butterflies stand on their food to eat because they taste with their feet. Plants can be beneficial or harmful to a butterfly, so they use tiny, hair-like sensors to determine if the chemicals in a plant are safe for food or harmful. By using these sensors in their feet, adult butterflies are able to identify the nectar they live on. Females also use this information system to determine the safety of a site for laying her eggs. Their proboscis is a long, curled tongue that resembles a straw. This is what they use to drink the nectar they find. Source: Reference.com

Step 2 : Answer to the question "Why do butterflies stand on their food?"

They taste with their feet:

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