The octopus draws water into its outer coat membrane, breathes it in, and then expels it through a short funnel-shaped body tube. Most octopuses crawl along the bottom of the sea with suckers, but when frightened, they will eject water from their body tubes in a powerful jet, which causes them to move quickly in the opposite direction.

When in danger, they emit an ink-like substance that acts as a smoke screen. Some species produce a substance that paralyzes the attacker's sensory organs. In order to avoid the "predator" of the hunt, the octopus in addition to the use of familiar mimicry camouflage, shedding "wrist" to protect themselves.

Temperate mollusks, living underwater, adapted to the water temperature can not be lower than 7 ℃, seawater specific gravity of 1.021 is the most appropriate, low salinity environment will die. Can ingest large animal plankton and growth. Widely distributed in the world's oceans of tropical and temperate waters.

Expanded Information:

Breeding

Octopus in the ocean reproduction time Concentrated in the spring and fall, spring and fall seawater water temperature of about 16 ℃. Octopus like to spawn in the conch shells, so the rope can be threaded through the red conch shells sunk to the bottom of the sea, extracted on time to catch. Autumn and winter often burrow in deeper waters in the sediment.

Octopus dioecious. The male has a specialized wrist, called the stem wrist or handing wrist, used to put the sperm packet directly into the female's coat cavity.

Every breeding season, the female octopus lays eggs, about 0.3 centimeters long, totaling more than 100,000, under rocks or in caves. The female guards the eggs during incubation, using a sucker to get them clean and stirring them with water.

Female octopuses need the young to hatch 4-8 weeks after a one-time egg laying. The juvenile octopus is shaped like an adult but small, and after hatching they need to drift with the plankton for a few weeks before sinking to the bottom and hiding.