Found thousands of these translucent blue, plastic-looking ovals washed up on the beach today. They have a stiff fin on top and blue jelly underneath. Are they dangerous?

Mysterious Blue Creatures on the Beach: What Are They and Are They Dangerous?

If you’ve ever walked along the and stumbled upon thousands of shimmering, translucent blue ovals scattered across the sand, you’re not alone. These unusual, plastic-like organisms often spark curiosity—and sometimes concern. With their jelly-like bodies and small, sail-like fins, they almost look like something artificial. But they’re very much alive.