Crabs are crustaceans belonging to the phylum Arthropoda. The largest crab in the world is the Japanese giant crab, whose legs are 1 meter long and whose body is like a huge plate. A crab native to Europe is also a giant brother among crabs. It is slightly smaller than the Japanese giant crab in size, with a carapace width of 12.5 to 25 cm, a stinger extension distance of 1.5 meters, and a weight of 7 kg. This crab is more similar to shrimp. It is called a crab because of its shape, which is created by the corresponding living environment. Modern taxonomy classifies them into a special family of stone crabs. This crab is caught as a seafood in summer every year and can be processed into delicious crab meat cans. "Laser weapons" of underwater animals
Squids and cuttlefish living in the underwater world can spray liquid flames for self-defense. The shape of the liquid they spray is very similar to their own body shape, so it is confusing to mistake the real thing for the real thing. Those who pursue them often catch wind and shadow in front of this glowing substitute. It is difficult to distinguish the real from the fake, and the implementer of the "eye-catching trick" has long disappeared.
Deep-sea shrimps are also equipped with "laser weapons" similar to squids. Special glands on their mouths will flash a screen of light at critical moments. Shrimp often move in groups. When encountering unexpected events, the countless light spots emitted by the shrimp group can form a barrier to block the pursuers, and they use the cover of light to escape. Some animals can grasp the moment when the pursuer's teeth catch them before emitting light. This self-defense trick often makes the attacker speechless, and the prey takes the opportunity to escape.
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