It's not just vipers that lay eggs. For example, there are 55 species of sea snakes belonging to 16 genus, which are oviparous snakes. They have completely got rid of their dependence on land, and it is difficult for them to move or walk on land.
All snakes in the family Serpentidae are oviparous; In the family Serpentidae, some snakes in the family Blind Serpentidae and Cobra are oviparous, while others are oviparous. Snakes that usually live in cold regions and mountainous areas are mostly oviparous, such as vipers. This mode of production can keep the eggs in the fallopian tube of the mother, so that the developing embryos can keep the required temperature, which is not affected by changes in the external environment. Almost all sea snakes are oviparous, so are red snakes and rattlesnakes.
The Indian python can lay 10 eggs at a time, and the cobra can lay 10 to 18 eggs at a time. Rattlesnakes can give birth to up to eight small snakes at a time. Russell's poisonous snake can shoot down 60 small snakes at a time. The incubation period of oviparous snakes is different. The incubation period of domestic mice is about two months, that of cobra is about 50 days, and that of Agkistrodon acutus is about 50 days.
Milk snakes are also egg-laying animals, and they have very strict requirements on the environment for spawning. Milk snakes usually lay their eggs in loose parts of rotten wood on the ground, or in holes under a smooth big stone, and these nests must be warm and humid. If the temperature and humidity are wrong, the eggs will soon become "dead eggs" or harden because they are too dry.
Ring-necked snakes usually lay eggs in late spring and early summer, and the number of eggs laid is less than 6. If a nest is especially suitable for female snakes, many female snakes will use a nest. So sometimes people will find hundreds of snake eggs in a nest.
The shell of a snake egg seems to be made of parchment, which is very tough. This green snake laid a nest of eggs in late spring. The long eggshell is so thin that it will sink in as long as you press it gently with your hand. Cobra's eggs are very strange. Before hatching, the volume and weight of eggs will gradually increase.
Except for a few snakes, snakes that lay eggs usually leave eggs. For example, some larger snakes, such as pythons and Indian snakes. , will coil around the eggs to hatch, because they are so tightly coiled that other animals can hardly see any snake eggs. This will not only keep the eggs warm, but also prevent the enemy from stealing snake eggs until they hatch.