Why is caution still advised when considering touching an adult Io moth, even though it lacks stinging spines?
Answer
Oils and rough contact from human hands can easily damage their delicate wings and scales
Even without venom, general entomological prudence suggests caution because human handling can easily damage the delicate wings and scales, compromising the moth's ability to fly or regulate temperature.

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IO Moth Caterpillars Can Sting - YouTube
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