The 'four-legged snake' is commonly known as the lizard and the stone dragon, because it has the word 'snake', and many people are afraid of poisoning after being bitten by it. In fact, a four-legged snake is neither a snake nor a bite.
The four-legged snake is about 20 cm long and has a particularly long tail, accounting for about two-thirds of the total length. Both are covered with scales, the snout is blunt and round, and the snout is 1.5 times the diameter of the eye; the nose is in the center of the nasal scales; and there are 2 to 3 small scales between the nasal scales, the nasal scales, and the first upper lip scales. The scales on the head vary in size and are ribbed. There is a layer of tympanic membrane covered with small scales; the eyelids are well developed, moving, and the pupils are rounded. The scales on the dorsal and body sides are smaller; there are scales in the center of the back, which get smaller and smaller backwards until the tail disappears; and there is a row of prismatic scales on the outside of the sides.
The four-legged snake is a national second-level wild protected animal. There are about 3,000 species distributed on Earth, and more than 150 species are known in China. They are mostly distributed in the tropics and subtropics, and vary greatly in size, from a few centimeters of Caribbean geckos to komodo dragons of nearly 3 meters.
Lizards, commonly known as "big four-legged snakes", are national second-level wild protected animals, mostly in Yunnan, And Guangdong, fujian less. Lizards are reptiles and have a wide variety of species. There are about 3,000 species distributed on Earth, and more than 150 species are known in China. Most are distributed in the tropics and subtropics, living in a variety of environments, mainly terrestrial, but also arboreal, semi-aquatic and punctured in the soil. Most of them feed on insects, and there are a few species of facultative plants. Lizards are oviparous, and a few are oviparous.
Most lizards feed on insects and some quails, and occasionally eat poultry, with sharp teeth with 3 cuspons. Herbivores (e.g., iguanas) have broad crowns, leaf-like, and serrated margins. Mollusks and crustaceans (e.g., the Caiman lizard [dracaena]) have blunt rounded teeth at the back of the palate to crush.
The gila monster of the southwestern United States and its mexican relative ( heloderma ) are poisonous , biting when provoked , but rarely fatal , with longitudinal grooves or folds on the medial sides of each tooth in the lower palate to draw venom. Most lizard teeth are born on the upper palate, anterior palate, and the edge of the tooth bone, while a few species grow on the palate. There are "oval teeth" on the pre-embryonic palate bone, protruding forward from the snout, used to drill through the egg shell, and degenerate after hatching. The way of teeth is mostly lateral, some species are top-born, and the two eyes of the avoidance can move independently. Many lizards have salt glands to expel mineral salts. Shoulder straps are present.
Most lizards have four legs, strong hind limb muscles, and can run fast and change direction. Cnemidophorus has a speed of 24 km/h (15 mph). Some lizards have stretched bodies, shortened limbs, and don't even have limbs. The toes of geckos, uta and spiny-toed geckos (spiny-toed geckos) are decorated to increase their surface area and prevent them from falling into the sand. Geckos can crawl on vertical glass panels. The green lizard has 5 toes on each foot, the webbed skin is divided into two groups, the outer hind limbs are divided into 3 toes, the inside of the 2 toes are formed into a group, the forelimbs are opposite, and the suitable male body has a pair of connectors - half penis. King lizards can run over short distances in the water.
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