Osmeterium

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Notion

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Science and technology

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What Wikipedia says

The osmeterium is a defensive organ found in all papilionid larvae, in all stages. The organ is situated in the prothoracic segment and can be everted when the larva feels threatened.

Excerpt from the Wikipedia article “Osmeterium”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: TheAlphaWolf, CC BY-SA 3.0, via Wikimedia Commons.