The box jellyfish (Chironex fleckeri), aka sea wasp, releases a toxin so powerful that it causes a rapid spike in blood pressure, which can cause cardiac arrest and lead to death. Auscape ...

If sharks can have a week of their own, why not jellyfish — especially the hyper-venomous box jellyfish? Most jellyfish are more bothersome than threatening, which is probably why no one would ...

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.