Meet the octopus with enough venom to kill 26 humans. Hint: It’s the size of a golf ball

Scientists say the blue-ringed octopus is the world’s most venomous cephalopod.

Its tetrodotoxin is made by symbiotic bacteria and can block nerve signaling, causing paralysis.

The golf-ball-sized animal can deliver a lethal dose to humans despite its tiny size.

The case highlights how bacteria-derived toxins help some marine animals defend themselves.