Yellow Boxfish - the unexpected killer - Seen in Red Sea.

The yellow boxfish. Though it may look funny, you wouldn’t want to laugh and upset it if you were a neighbor on the reef!
This one’s the real killer – literally! You don’t want to stress a yellow boxfish in any way. If one becomes alarmed or is threatened, it reacts – by blowing itself up to appear more dangerous and releasing a cloud of ostracitoxin, AKA pahutoxin, a powerful toxin that will kill any fish in the immediate surroundings.
By the way, this unique fish toxin is also lethal to other yellow boxfish (and themselves!) – one reason why they are pretty solitary.
Ostracitoxin is not their only defense system. Their boxlike body is formed from rigid bony plates with holes to allow their mouth, eyes, fins, and tail to operate. Any predator that tries to gobble up a yellow boxfish is going to be severely disappointed. 
If they don’t get zapped by the poison, they will certainly need a trip to the dentist!

The yellow boxfish is present in Pacific and Indian Ocean. The one of our video was swimming in Red Sea.

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