Turtle (scientific name: Chelonioidea) is a general term for turtles. Widely distributed in Atlantic Ocean, Pacific Ocean and Indian Ocean. Trionyx sinensis is distributed in Shandong in the north and Beibu Gulf in the south. The length can reach more than 1 m, and the maximum life span is about 150 years old. There is a pair of forehead scales on the top of the head. The limbs are like paddles, the forelimbs are longer than the hind limbs, and there are one claw on each side. The head, neck and limbs should not be retracted into the nails. Mainly feed on seaweed. Living in Atlantic Ocean, Pacific Ocean and Indian Ocean, laying eggs and hatching larvae on land. It is a national second-class protected animal. Turtles adapt to life in water, and their limbs become fins, which is good for swimming. Generally, it only leaves the water and goes ashore during the breeding season. Female turtles lay eggs in caves dug on the beach.
This turtle has a flat upper jaw, a slightly curved lower jaw, and a serrated beak. The scale of forehead 1. The carapace is heart-shaped. Shields are inlaid and arranged. 5 laminae; 4 ribs on each side; 1 1 piece on each side of the edge shield. Stroke your limbs. The forelimb is longer than the hind limb 1 claw, and the inside has 1 claw. The male tail is long, which can reach half of the body length. The claws of the forelimbs are large, curved and hooked. The carapace is olive or brown, mixed with light markings; Abdominal nails are yellow.
The largest turtle is leatherback turtle, which is 2 meters long and weighs 1 ton. The smallest is the olive-green scale turtle, which is 75 cm long and weighs 40 kg.
The most unique thing about turtles is their shells. It can protect turtles from infringement and let them swim freely at the bottom of the sea. All turtles have shells except leatherback turtles. The leatherback turtle has a thick oil skin with five longitudinal edges. Unlike turtles, turtles can't retract their heads and limbs into their shells. Their limbs are paddle-shaped so that they can swim flexibly in the sea. The forelimb is mainly used to push the turtle forward, and the hind limb controls the direction like a rudder when swimming. In addition, the salt glands of turtles can secrete excess salt in the body. Male and female turtles have the same posture before maturity. When the male turtle matures, its tail becomes longer and thicker because the reproductive organs are at the bottom of the tail.
Turtles live in the upper ocean. Feeding on fish, cephalopods, crustaceans and seaweed. Although turtles have no teeth, their beaks are very sharp, and different kinds of turtles have different eating habits. Turtles are divided into herbivores, carnivores and omnivores.
Turtles and shell turtles have jaws that can grind crabs, some mollusks, jellyfish and corals. The hawksbill turtle's upper beak is hooked like an eagle's beak, and sponges, shrimps and squid can be found in coral gaps. Green turtles and black turtles have serrated jaws and mainly feed on seaweed and algae.
Turtles swallow seawater while eating aquatic plants and ingest a lot of salt. Some special glands next to the lacrimal gland of the turtle will excrete these salts, causing the turtle to "cry" on the shore.
April ~ 10 is the breeding season of turtles every year, and it takes 3 ~ 4 hours to mate on the water near the reef plate. Female turtles lay eggs many times a year, 9 1 ~ 157 each time. At night, female turtles usually choose the beach with small slope and soft sand to land. After finding a suitable spawning ground, the female turtle will dig a cave and lay eggs in the cave. The egg is white, round, tough and elastic. At the same time, the female turtle will secrete a lot of mucus and attach to the surface of the egg to form a protective layer to prevent water from evaporating.
After laying eggs, the female turtle will carefully pull the surrounding sand back to the cave with her hind legs to cover her eggs, then slowly climb out of the cave, and then level the sand in the cave with her forelimbs and climb back to the sea. Turtles have no habit of taking care of eggs.
It takes about 40 to 70 days for young turtles to break out of their shells, climb out of their nests in groups at night and quickly climb to the sea under the guidance of light, but the chances of young turtles surviving are only one in a thousand.
Most turtles live in shallow coastal waters, bays, lagoons, coral reefs or estuaries that flow into the sea. Humans usually find turtles in warm and comfortable waters around the world.
The vowel combination ur forms a long vowel/? When pronouncing, leave the lower teeth and roll up as far as possible behind the gums. The middle part of the tongue is convex, and the tongue position is close to half height, which is the highest of the three vowels. The gums are nearly half closed, the lips are slightly flat, and they are pulled to the left and right to show a smile. This sound appears at the beginning, middle and end of words, for example:
Turtle turtle
surfing
Turkey Turkey
Fur fur
Hurt pain
wallet
Nurse, nurse, nurse, nurse.
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