First, the varieties are different.
1, tortoise
Turtles, also known as green turtles. Chordata, reptiles, turtles, turtles, turtles, turtle species.
2.tortoise shell
Tortoise shell, also known as thirteen scales, hawksbill, Wen Jia, hawksbill, hawksbill and chickpea. Reptiles, turtles, turtles, turtles, turtle species.
Second, the morphological characteristics are different.
1, tortoise
Body length 1 m, a pair of forehead scales on the top of the head, short round nose and mouth, slightly hooked jaw, strong serrations on the edge of jaw, and a middle ridge connected with short pointed odontoid process on the chewing surface. When living, the carapace is olive green or brown, mixed with yellow and white radial lines, and the carapace is yellow. The head and limbs are brown. The head and back have symmetrical scales, the limbs are paddle-like, 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.
2.tortoise shell
Generally, it is about 0.6 meters long, and the largest can reach 1.6 meters. There are two pairs of forehead scales on the top of the head, the snout is flat, and the front end of the upper jaw is hooked like an eagle's mouth, with two pairs of forehead scales. The armor shield on the back is arranged in a shingle shape, and the horny plates on the back are arranged in a shingle shape, with a smooth surface and alternating brown and light yellow. The limbs are flippers. The forelimb has two claws. The tail is very short and usually doesn't show out of the nails.
Third, different living habits.
1, tortoise
Living in the ocean all my life. Feeding on fish, cephalopods, crustaceans and seaweed. April-10 is the breeding season. Female and male turtles often mate for 3-4 hours in reef plates or coastal waters. After mating, the females climb the beach at night and dig a pit to lay eggs. First, they dig a hole as deep as their height with their forelimbs, and then they lie in the hole. Then, they dig an "egg pit" with a diameter of 20 cm and a depth of about 50 cm through the alternating movement of their hind legs, and lay eggs in the pit.
It can lay eggs 23 times a year, with 9 1- 157 eggs each time, with a maximum of 238 eggs. Egg white, spherical, leathery, tough, egg diameter 35-58 mm. The incubation period is 30-90 days, usually 45-60 days. After hatching, the young turtles crawl back to the sea to live.
2.tortoise shell
Tortoise shell is a large and fierce carnivore in the ocean, which often haunts coral reefs. It mainly preys on fish, shrimp, crabs and mollusks, and also eats seaweed. Strong activity ability and fast swimming speed. Tortoise shells like to feed on coral reefs, continental shelves or shoals covered with brown algae.
The spawning period of hawksbill hawksbill hawksbill is from March to April. During spawning, females land during the day and dig holes in the coastal sand to lay eggs. These holes are about 20 cm in diameter and 30 cm in depth. They lay eggs three times in a spawning period, and the amount of eggs laid each time is 130-200. Oval, white, soft and elastic shell. Eggs are about 3.5 cm in diameter. The hatching time is long, and it takes about 2 months for larvae to hatch. The newly hatched turtle shell is not completely hard, but it has been covered with tiles. The turtle shell is about 43-48 mm long. The young turtle's neck can stretch freely, but it can't rotate back and forth.
Baidu encyclopedia-tortoise
Baidu encyclopedia-hawksbill