Cuttlefish is an animal of Cephalopoda, a mollusk. When encountering a strong enemy, cuttlefish will use "inkjet" as an escape method and wait for an opportunity to leave, so it has the names of "squid" and "cuttlefish". There are pigment vesicles in the skin, which will change color and size with the change of "mood". Squid will jump out of the sea and have amazing air flight ability.

Cuttlefish is a large carnivorous mollusk, which is different from ordinary shellfish and has its own evolution process. Common shellfish, in order to wait for the rabbit to filter the tiny zooplankton, have a small range of activities and move slowly; However, cuttlefish needs more room for activities in order to take the initiative to attack and grab high-nutrient food, so its appearance has changed greatly after a long evolution process.

Life habits:

Cuttlefish grow in the open sea or at the junction of the bay and the open sea, and inhabit the environment with hidden objects and at least 20 meters of water depth, such as seaweed or rocks. The ink sac is particularly developed. When encountering an enemy, it can spray dark brown juice to confuse the enemy's sight and escape.

The body is soft, not segmented or pseudo-segmented, and usually consists of five parts: head, feet, trunk (visceral sac), mantle and shell. In addition to lamellibranchia, there are jaws and toothed tongues in the mouth; The nervous system includes ganglia, nerve cords and a nerve ring around the esophagus. The body cavity retreats to the pericardial cavity.

Reference to the above content: Baidu Encyclopedia-Cuttlefish