The muscles are strong, the opening of the hair cavity is narrow, and there is generally no water hole on the body surface. The body is short oval, cystic and flipless; The boundary between head and body is not obvious. Octopus's head and body are about 7-9.5 cm, with large compound eyes and eight retractable wrists.
I usually crawl with my wrist, sometimes I swim by stretching my wrist membrane, so that I can hold other things strongly and use the funnel at the bottom of my head to spray water and retreat quickly.
As a temperate mollusk, living underwater, its adaptive water temperature should not be lower than 7℃, and the most suitable seawater proportion is 1.05438+0, and it will die in a low salinity environment. Can eat large animals and plankton and grow.
Octopus can not only spray ink six times in a row, but also change its color and structure like the most flexible chameleon, becoming like a stone covered with algae, and then suddenly pouncing on its prey, which has no time to realize what happened.
Extended data:
Octopus breeding method:
The breeding time of octopus in the ocean is generally concentrated in spring and autumn, and the seawater temperature in spring and autumn is about 65438 06℃.
Octopus likes to lay eggs in snail shells, so it can sink to the bottom of the sea with a rope through the red snail shells and be caught on time. In autumn and winter, they often make holes in deep-water sediments.
Octopus is hermaphrodite. The male body has a special wrist, called stem wrist or crossed wrist, which is used to put the sperm bag directly into the coat cavity of the female body.
Every breeding season, female octopus lays eggs, about 0.3 cm long, with a total number of more than 654.38+ 10,000, which are produced under rocks or in caves.
During the incubation process, the female guards the eggs, cleans them with suction cups and stirs them with water.
Female octopus needs larvae to hatch 4-8 weeks after spawning once. The young octopus looks like an adult and is very small. After hatching, it needs to drift with plankton for several weeks, and then sink to the bottom of the water for concealment.
Baidu encyclopedia-octopus