The Portuguese Man o’ War are responsible for up to 10,000 human stings in Australia each summer. The stinging, venom-filled nematocysts in the tentacles of the Man o’ War can paralyze small fish and other prey. Detached tentacles and dead specimens (including those that wash up on shore) can sting just as painfully as the live creature in the water and may remain potent for hours or even days after the death of the creature or detachment of the tentacle.

Stings usually cause severe pain to humans, leaving whip-like, red welts on the skin that typically last 2 or 3 days after the initial sting, though the pain should subside after an hour. However, the venom can travel to the lymph nodes and may cause, depending on the amount of venom, a more intense pain. Stings may also cause death, although this is extremely rare. 

(Source: kim-jong-chill)

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