July 6, 2026•1 min read•from Marine Biology Subreddit

Spotted dozens of these in the Cook Islands a few days ago - box jelly?

My dive master had never seen them before and she thought they're box jellyfish. Any ideas?

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#box jellyfish

#marinebiology

#Cook Islands

#jellyfish

#dive master

#diving

#marine life

#ocean

#reddit

#wildlife

#invertebrates

#Cnidaria

#sting

#identification

#species

#ecology

#tropical

#Pacific Ocean

#aquatic

#zooplankton