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Sea turtle, living fossil

Sea turtle, living fossil (Picture 1)
Sea turtle, living fossil (Picture 1)
Sea turtle, living fossil (Picture 2)
Sea turtle, living fossil (Picture 3)
Sea turtle, living fossil (Picture 4)
Sea turtle, living fossil (Picture 5)
Sea turtle, living fossil (Picture 6)
Sea turtle, living fossil (Picture 7)
Sea turtle, living fossil (Picture 8)
Sea turtle, living fossil (Picture 9)
Sea turtle, living fossil (Picture 10)
Sea turtle, living fossil (Picture 11)
Sea turtle, living fossil (Picture 12)
Sea turtle, living fossil (Picture 13)
Sea turtle, living fossil (Picture 14)
Sea turtle, living fossil (Picture 15)

Turtles live in the subtropical offshore layer and live in the ocean for life. Most sea turtles live in shallow waters along the coast. Some species of sea turtles live in food-rich waters in winter and make a long migration during the season of spawning. The feeding habits are very mixed, feeding on fish, cephalopods, crustaceans, molluscs and seaweeds. Mainly distributed in the warm waters of the Pacific, Atlantic and Indian Oceans. Sea turtles appeared on the earth more than 200 million years ago and are famous "living fossils". According to the "Guinness Book of World Records", sea turtles can live up to 152 years and are well-deserved elders among animals.

Turtles are actually good swimmers, and their long forelegs are like oars, making them very suitable for life in the water. Sea turtles have a migratory habit, as sea turtles migrate to waters with higher water temperature to resist the cold after the sea temperature drops. But sometimes the peak surface comes too fast, the water temperature drops rapidly, and the turtle's body temperature, physiological activity and buoyancy control cannot be adjusted in a short time, and it will freeze to death. Sometimes these turtles stay at the bottom of the mud for a long time, their metabolic rate also decreases, and they perform hibernation-like behaviors. This is one of the few examples of hibernation found in marine life.

After many years of research, American scientists discovered that the earth's magnetic field is the compass and map for turtles when they return home. Scientists have long discovered that sea turtles can use the earth's magnetic field and the position of the sun and other stars to identify directions. But for migrating sea turtles, it is not enough to have a sense of direction. They may also have a "map" to clarify their geographic location and finally reach a specific destination. Turtles use their lungs to breathe, but their chests cannot move. It is a swallowing breathing method. Every once in a while, they stretch their heads out of the sea to breathe. But you can also live underwater for a long time, relying on the anal sac to filter oxygen. But at night, sea turtles have to float on the water to rest. At this time, they breathe entirely on their lungs.

Turtles have a mixed diet, feeding on fish, cephalopods, crustaceans, molluscs and seaweeds. Sea turtles swallow sea water while eating aquatic plants, ingesting a lot of salt. Some special glands next to the tear ducts of sea turtles discharge these salts to maintain the same density of salt inside and outside the body, which is why sea turtles are "tearing" on the shore. The newly hatched turtles must leave their nests, crawl across the beach, and return to the sea regardless of the topography of the beach or climate change. This is because the visual system of sea turtles reacts positively to light signals, causing them to crawl towards the ocean with dense positive charges. Newborn turtles have many enemies, such as seabirds and large lizards. The young turtles often encounter enemy attacks on their way back to the sea. The survival rate of baby turtles is very low. On average, only one or two out of 100 survive.

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