Swallowtail Caterpillar Osmeterium
Cite it:
Brown, C. (2025). Swallowtail Caterpillar Osmeterium. Knowledge Commons. https://doi.org/10.17613/v471w-0xw37
This frame-by-frame animation illustrates the defensive response of a swallowtail caterpillar (Papilio spp.). When threatened, the caterpillar everts its osmeterium, a Y-shaped glandular organ located behind the head, using fluid pressure. The bright coloration and release of pungent chemical compounds serve to startle and deter potential predators.
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