Snakes are divided into four parts: head, neck, trunk and tail. Seven inches is at the junction of neck and torso. Snakes have a big appetite and eat a lot. They usually kill them first and then swallow them. The mouth can change with the size of the food. When encountering larger food, the lower jaw becomes shorter and wider, forming a film that tightly wraps the food. Snakes are often swallowed from the animal's head, while birds swallow from the top of their heads, so that their beaks bend to the bird's neck without stabbing Shekou or esophagus.
Snakes are a kind of animals among chordates and reptiles. The body is slender and divided into three parts: head, trunk and tail. There are no limbs or claw-like hind limbs on both sides of the transverse fissure of the lower snake. Full of scales; The head has different shapes, and the nostril is located on the snout side, but the Hydraceae species that live in the sea for life are located on the snout back; There is protective transparent skin outside the eyeball, the pupil is round, vertical oval or horizontal oval, there is no movable eyelid, and the crystal is almost spherical.
Snake habitat
The habitats of snakes vary from species to species, and there are various habitats. Some live in caves, some live on the ground, some live in trees, and some live in snakes in water.
Snakes that belong to cave life are mostly primitive and low-level small and medium-sized snakes. Because of their adaptation to cave life, their anatomical structure features are: small head and firm skull connection; Small mouth, prominent strategy before mouth, underdeveloped eyes; Short tail; Abdominal scales are undifferentiated or underdeveloped. Such as blind snakes and flashing scale snakes. Snakes living in caves come to the ground more often than at night or in dark weather. They are all nontoxic.
Living in trees or shrubs most of the time. Slender body, long tail, suitable for winding; Big eyes and developed eyesight; Abdominal scales are wide, the center is flat, both sides are slightly backward, and there are sides. Such as Golden Flower Snake, Green Slender Snake, Forest Snake, etc. Bamboo leaf green is an arboreal snake, but it does not have the above typical characteristics. In addition, welding heads and others often climb trees.
The above contents refer to Baidu Encyclopedia -Snake.