Triggering the salivary glands
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Black swallowtail butterfly caterpillar (Papilio polyxenes)
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1791 Pierre Olivier, père de mon arrière grand mère paternelle Perrine
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Male klipspringer have prominent facial glands to mark their territory
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Pine Siskin... phew, does it smell under there? No, because birds do not have sweat glands!
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