2. Manta rays use their unique big fins to vibrate slowly like spreading their wings and swim leisurely on the bottom of the sea. Sometimes it's a pleasure to watch it "fly". Sometimes they jump out of the sea, and sometimes they do somersaults in the air. It's really beautiful. Manta family animals can reach 8 meters in length and weigh 3 tons, which is the largest in suborder. Flat body, powerful pectoral fins, similar to wings, cruising in the ocean. There are two narrow ear-shaped protrusions in front of the pectoral fin, which can collect food from the mouth. Although manta rays are large animals, they mainly feed on plankton and small fish, often cruise around coral reefs for food, and have a gentle temperament. In English, it is wrongly called "devil fish", mainly because of its terrible shape.