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Project Noah Nature School
A common mormon poking its osmeterium when it was threatened. The osmeterium is a fleshy organ found in the prothoracic segment of larvae (caterpillars) of Swallowtail butterflies including Birdwings. This organ emits smelly compounds believed to be pheromones. Normally hidden, this forked structure can be everted when the caterpillar is threatened, and used to emit a foul-smelling secretion containing terpenes
Spotted on Jun 3, 2012
Submitted on Jul 6, 2012
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