Octopus (scientific name: Octopoda), commonly known as Octopus, belongs to the class Cephalopoda. Octopus is the cleverest of all cephalopods, and many scientists will conduct experiments on octopus to test its intelligence. Octopus is also a traditional food in Korea, Japan and Mediterranean countries, which has an important impact on their lives.
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Octopus habit
Different octopuses have different living habits. Most octopuses live in caves under the sea, even waiting for their prey to appear in caves. Octopus has the ability to change color, which comes from the pigment cells in octopus. When it is in danger and static state, it has the function of camouflage, so as to escape from the enemy and wait for an opportunity to hunt.
Octopus has a developed brain. Put the food in a covered glass bottle and put it in the octopus's fish tank. Octopus will know how to open the bottle cap and eat.
Octopus is a carnivore, and its food includes crabs, fish, shellfish and starfish. Large octopus even preys on lobsters, big fish and small and medium sharks. Octopus has few natural enemies. Tough fish are one of the few marine natural enemies that can overwhelm octopus. They can bite off the tentacles of octopus one by one. Octopus will spit out ink when it meets natural enemies, or disguise itself by changing its color.
Octopus ink is a viscous suspension containing 200 mg of spherical particles per milliliter. Some octopuses can spit out six times in a row, and it takes more than half an hour to store "ink".
The chemical composition of ink is a complex of melanin (indigo quinone) and proteoglycan, and there are toxins that paralyze the enemy. Harmless to human beings, edible, and even used as brush ink. Octopus tentacles, if broken, can grow back soon.
In addition, octopus likes to get into any cave, so some fishermen (especially Japanese fishermen) will use it to make ceramic octopus pots that sink to the bottom of the sea. After the octopus enters the octopus pot, it cannot escape.
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