The army of spider crabs tore octopus under the sea

The army scene of the giant spider crab tearing off the octopus was recently recorded in the seabed of Port Phillip Bay, near Melbourne, Australia.

According to Herald Sun, giant spider crabs often "invade" Port Phillip bay between May and June. About 100,000 spider crabs will molt, shed their old coat.

But Melbourne divers recently were quite surprised to discover that the herd of spiders came so early.

Scene of the spider flock tear the octopus.

The video was filmed by Chiharu Shimowada, recording the moment when the string of spider crabs tore apart the octopus tassels. In 10 years of practice, this diver said he had never encountered such a scene.

Nobody knows exactly why spider crabs migrate to shallow water or why this solitary animal is concentrated in one place to form a large herd.

The spider crabs gather together to avoid being eaten by predators.

"The crabs in the water are very shallow, so anyone can observe this interesting phenomenon," Shimowada said.

Dr. Mark Norman, director of Victoria Conservation Park, said the spider crabs, about the size of a football, could start gathering in large numbers in March.

Spider crabs are often concentrated in flocks in Australia around May-June, when they shed their shells.

According to Norman expert, the migration coincides with the time of molting to become bigger, so the spiders are relying on a large number to ensure safety.

After molting, the crab's body is very soft until a new crust forms, making them vulnerable to rays, sharks and many other predators.

Spiders gather into large flocks, reducing the risk of being eaten. Even bad marine animals can be torn off if they venture too close to the crabs.