Watch this Octopus Devour Crabs as It Jumps in the Water | Insane Animals | Secrets of the Octopus

Positioning rocks to make the perfect cover, the trap is set. Well-earned brain food. The island octopus has thought up, tested, and executed a killer hunting technique.

Six months old, entirely self-taught, and already an accomplished strategist, as she crushes her crab with her powerful, birdlike beak. The succulent scent of her meal attracts attention. She could lose her dinner or her life; an ambush.

She releases toxins that liquefy the crab's insides, making crab soup. Scarlet must concentrate on her prey, not become it. Reef sharks aren't always on the lookout for an easy meal.

This time, Scarlet uses her talents not to blend in but to confuse the sharks. Should swim right by. Stretching the skin on her arms taut and wide, she flashes white—it's purposefully weird. Finally, a tasty crab, even if she really had to pull out all the stops to get it.

It's brains versus prawn. Time to see what being one of the fastest learners on the planet gets you when your back's against the wall. The octopus blasts the shrimp with water, but this tiny terror is just too fast and his punch too painful.

Then the octopus has an idea. She picks up the building blocks of her house and repurposes them. She's imagined herself a shield.