The Pacific giant octopus is the largest octopus known, with a circumference of 5-6 meters and a weight of 50 kilograms. Their life span is about four years. Both females and males will die soon after spawning, and their heads are large and round, usually reddish brown.
Pacific giant octopus has a high IQ. They can learn to open cans, imitate other octopus, and successfully pass through the maze in the experiment. Their specific number is not clear, and they are not endangered animals or natural enemies at present. However, they are very sensitive to the environment and may be threatened by serious pollution.
Habits of Pacific giant octopus
Pacific giant octopus is short oval, saccate and flipless. The boundary between head and body is not obvious. The head has a big compound eye and eight retractable wrists. Each wrist has two rows of fleshy suckers. The base of the wrist is connected with webbed tissue. There is a mouth in the middle. The mouth has a pair of sharp horny palates and a file-like toothed tongue. The body color is usually reddish brown and can be changed by unique pigment cells.
Pacific giant octopus preys at night, mainly including shrimp, clams, lobsters and fish. They even attack and devour sharks and birds. They are very sensitive to the environment. They can change color through unique pigment cells, and can even be skillfully mixed with corals, plants and rocks with complex patterns.