3 facts
When a butterfly lands on a potential food source, specialized chemoreceptors on its tarsi (feet) determine if the plant is suitable for laying eggs or if nectar is present. This allows them to 'taste' before feeding.
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They have chemoreceptors on their tarsi (feet) that allow them to 'taste' leaves to determine if they are suitable for laying eggs. This crucial adaptation ensures their larvae have an appropriate food source immediately upon hatching.