The blue bottles are coming, but what exactly are these creatures?

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Blue bottles have been washing up on beaches lately, but what exactly are they? And are you really supposed to pee on their stings?

Thousands of Blue Creatures Wash Ashore on California Beaches. What the Heck Are They? - Active NorCal

Bluebottle Fly and the Truth About Their Sources - Rose Pest

ABC Hobart - This stinging blue bottle jellyfish was spotted on a beach on Tasmania's east coast this week 😮🌊 Have you seen any washed up recently? 📷: Elaine McDonald

Blue bottle - Openwaterpedia

What is this creature in Maui : r/animalid

No idea where to post this other than here but what type of jelly is this, it's cool and blue. This is in florida btw. : r/whatsthisbug

The Bluebottle Fly, Interesting Facts About It And Its Ways

Blue Bottle stings: Look beyond the venom of the Portuguese Man O'War landing on Mumbai beaches

Bluebottle Fly, Weird n' Wild Creatures Wiki