Irukandji Jellyfish

Caused by the tiny but deadly Irukandji jellyfish of Australia, this venomous sting triggers intense pain, nausea, profuse sweating, full-body cramps, and an overwhelming sense of impending doom. Victims have begged doctors to kill them. The jellyfish, often less than an inch in size, includes species like Malo kingi, named after an American tourist who died in 2002. Their venom can cause hemorrhaging and hospitalizes 50-100 people each year.

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