Swimming in Florida's waters? Be mindful and avoid this often unseen animal, which can cause pain if you accidentally come into contact with it.

The infamous box jellyfish developed its frighteningly powerful venom to instantly stun or kill prey, like fish and shrimp, so their struggle to escape wouldn’t damage its delicate tentacles.

Last month, content creator Julie — who posts under the TikTok account @julieanddaniel_ with her boyfriend Daniel — shared a clip of moment she sat on a deadly box jellyfish while she was ...