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Rays: A general term for many kinds of flat cartilaginous fishes, which are distributed in most waters of the world, from tropical to near-Arctic waters, from shallow water to deep water below 2700 meters. Devil fish refers to rays. Kissing triangle, protruding or obtuse, with no kissing teeth at the edge. The pectoral fin expands forward to form a large or wide body disk, and the nostrils are far from the mouth, which is relatively primitive. 2 dorsal fins, no hard spines; The tail stalk is thick and the tail fin is developed. Rays have a circle of fan-shaped pectoral fins around their bodies, and their caudal fins degenerate like a long thin whip, moving forward by the wave-like movement of pectoral fins. Rays usually hide in the sand. When two shells, crabs and shrimps approach, they will suddenly attack. Their teeth are like stone mortar, which can grind anything, and there is a poisonous red thorn on their back, which will kill people.

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Living habits: Rays are very similar to Rays because they both have flat bodies. Juvenile rays feed on animals that live on the bottom of the sea, such as crabs and lobsters. When I grow up, I mainly prey on mollusks such as squid. When hunting, rays mainly hunt by smell. When rays lie on the bottom of the sea, they try to avoid inhaling sediments by using special closed breathing methods. When rays breathe, water is inhaled through the pipe overhead and finally flows out through the cracks in the cheeks of the abdomen.