Soft shelled turtles, also known as soft shelled turtles, refer to aquatic turtles belonging to the order Turtles and family Turtles. Soft shelled turtles are distributed in freshwater streams and lakes in Asia, Africa, and North America. The characteristics of soft shelled turtles are a round, soft crust like pancake, webbed legs, a long head and neck, and nostrils located at the front of the fleshy long nose (female turtles are noticeably larger than male turtles). There are two main species of soft shelled turtles in the New World, the prickly soft shelled turtle and the smooth soft shelled turtle, whose dorsal shells are gray or brown. The smooth shell turtle has a shell length of about 35 centimeters, while the soft shell turtle has a shell length of about 45 centimeters, mainly distributed in the United States. There are two species of soft shelled turtles in the Old World: African turtles and Malay turtles.

Sea turtles are a collective term for marine turtles in the order Turtles, family Turtles, and family Turtles. Body length 0.75-2 meters, weight 45-1000 kilograms. Distributed in the South Pacific and Indian Ocean. In China, it is distributed from Shandong coast in the north to Guangdong coastal provinces, Taiwan, Hainan and other provinces in the south, especially the South China Sea Islands. Most of them live in shallow coastal waters, bays, coral reefs, and estuaries that flow into the sea. Feed on macroalgae, cephalopods, crustaceans, and fish and shrimp. They are one of the oldest animals in the world, appearing on Earth more than 200 million years ago, so archaeologists consider them as "living fossils".

Caretta is a marine animal belonging to the order Turtles and family Turtles. The body length is 100-200 centimeters and the weight is about 100 kilograms. The head is relatively large, about 15 centimeters wide; Both the upper and lower jaws have extremely strong hooked beaks. One more claw than a green sea turtle, suitable for swimming. The tail is relatively short. I enjoy foraging in coral reefs, continental shelves, or shallow waters covered in brown algae. Mainly preys on benthic or floating crustaceans, mollusks, cephalopods, jellyfish, and other invertebrates. Distributed in warm waters of the Atlantic, Pacific, and Indian Oceans, as well as in the South China Sea and East China Sea.