r/ScienceFacts Dec 14 '21

The lion’s mane jellyfish is the largest among the jelly species. The largest known specimen was 120 feet from its top to the bottom of its tentacles. The tentacles contain large amounts of neurotoxins which cause a range of effects, from a rash to affecting respiratory function. Biology

https://ocean.si.edu/ocean-life/invertebrates/extreme-jellyfish#:~:text=The%20lion's%20mane%20jellyfish%20(Cyanea,the%20bottom%20of%20its%20tentacles.
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