The only species that knows how to defend itself

Researcher Stephanie Bush at the Monterey Bay Aquarium Research Institute recently discovered that Octopoteuthis deletron squid is capable of removing part of its hand when attacking or when it is attacked by an enemy to defend.

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According to Bush, O. deletron is the only squid species that can automatically cut off part of its arm. This is different from the octopus, which always launches all its tentacles when in a stressful situation.

O. deletron squid has the ability to self-destroy part of its hand (Photo: Phys.org)

The finding was demonstrated by the Bush team in the experiment, when they attached a brush to two O. deletron ink arms. Then let this squid dive into the sea at a depth of 830m. The result after 10 seconds of stopping motion, the squid removed from the affected object by self-destructing part of the arm.

Bush also found the same result, when experimenting to provoke O.deletron squid in the lab, 7 out of 11 of them destroyed part of their arms. This behavior of lizard-like ink cuts off its tail itself. But the O.deletron ink cuts the arm part closer to the attacking object, thus minimizing the loss of the body.

This new discovery also adds a very attractive self-defense feature of ink. In addition to the ability to squirt ink to create a dark cloud that allows it to escape the enemy, it can also cut off its part to escape. Accompanied by it will spray a stream of light to distract enemies or prey to facilitate ink attack or escape. The lost arm part will then be regenerated but it will take some time.