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What are the differences between octopus and squid?
1. The body structure is different: the head of the octopus is about 7-5 cm, with large compound eyes and 8 retractable wrists.

2. Each wrist has two rows of fleshy suckers. The wrist length of octopus is about12cm, that of octopus is about 45cm, and that of octopus is about 35cm.

3. Squid and cuttlefish belong to Decapoda, with ten brachiopods, conical body, pale body with light brown spots, big head, touching feet 10 in front, and triangular fleshy fins at the tail end.

4. In addition, the tail of squid has a "bone" similar to a plastic piece.

5. As for Octopus, the inner shell has completely degenerated, so they have excellent body-shrinking skills and can drill in and out from very small holes.

6. Different appearance and shape: Octopus is short oval, saccate and flipless.

7. The boundary between head and body is not obvious. In addition, octopus has highly developed cells containing pigments, which can change its body color very quickly.

8. Squid is generally slender, with a long diamond-shaped end and fleshy fins on both sides of the carcass. When viewed upside down, it looks like a "javelin head".

9. The dried product is flat and massive, slightly slender.

10. Different living habits: Octopus generally crawls along the bottom with a sucker in its wrist. It is a nocturnal animal that is very sensitive to light and likes to stay in a dark environment.

1 1. Living underwater, the water temperature should not be lower than 7℃, and the specific gravity of seawater is 0.21.The environment with low salinity will die.

12. The sediment in the sea area is preferably gravel zone.

13. It feeds on Cladocera and Crustacea (shrimp, crab, etc.), and some species feed on plankton.

14. Squids like light, so fishermen use their habits to hang fish-collecting lights on fishing boats and wait for them to flock, and then catch them all.

15. It often moves in the middle and upper layers of shallow water, and its vertical movement range can reach more than 100 meters.

16. It feeds on krill, sardines, silverfish, small male fish, etc., and is itself the prey of fierce fish.

17. Eggs mature in batches and are produced in batches. Eggs are wrapped in colloidal egg sheaths. Each egg sheath contains several to hundreds of eggs depending on the species, and the number of eggs laid by different species varies greatly, from several hundred to tens of thousands.