Are giant arboreal or aquatic snakes viviparous or oviparous?

In people's common sense, snakes lay eggs because they lay eggs. in fact, snakes reproduce in two ways: egg laying and egg birth. So are giant arboreal or aquatic snakes viviparous or oviparous? According to data, oviparity is to lay eggs directly, while oviparity is to hatch the eggs in the body without ovulation after insemination. Pythons are oviparous, and the so-called oviparity means that eggs are shot in the stomach and hatch directly in the belly, so the little snake we see comes directly from the mother's belly, and there are no eggs. All snakes of the family Serpidae lay eggs. Agkistrodon halys and sea snakes (16 genera and 55 species) are oviparous snakes, pythonidae, blind snakes and cobras, some of which are oviparous and some oviparous. On the other hand, pythons have a peak reproduction rate from late April to late May, laying eggs. Females lay 12-50 eggs each time, and their eggs are white and weigh about 30 grams. The female python has the habit of crouching on the egg pile, does not eat at this time, the body is hot, the body temperature is several degrees higher than usual, which is conducive to the hatching of eggs.

Oviparous snakes have completely freed themselves from dependence on land and are difficult or unable to walk on land. Snakes that usually live in cold regions and high mountains are mostly oviparous, such as snakes. This mode of production can make the eggs stay in the mother's fallopian tube, so that the developed embryos can maintain the required temperature without being affected by the changeable environment.

Almost all sea snakes are also oviparous, red snakes and rattlesnakes are also oviparous. Their fertilized eggs grow and develop in the female snake, but there is no direct connection between the embryo and the mother. The substance stored in the egg is the only source of nutrition, which is essentially different from the real viviparity. But there are exceptions. There are two kinds of snakes in Australia, whose embryos can get nutrients from their mothers, a bit like viviparity. Agkistrodon halys, Zhuyeqing, vipers and most sea snakes are oviparous snakes. Some snakes give birth to small snakes directly, which can be said to be viviparous, but this is different from the viviparity of real mammals. Their fertilized eggs develop in the fallopian tubes of female snakes, but the nourishment needed for embryonic development comes from the yolk of fertilized eggs. It is not through the umbilical cord to absorb the nutrition of the mother from the placenta, so it is also called oviparity.

Attachment: egg viviparity (also known as pseudoviviparity) refers to the reproductive mode in which an animal's egg develops into a new individual in the mother before giving birth to the mother. However, the nutrition needed for its development still depends on the yolk stored by the egg itself, and has no material exchange relationship with the mother, or a mode of reproduction in which gas exchange and little nutrition are carried out with the mother only in the later stage of embryonic development. It is a way of reproduction between oviposition and viviparity. Agkistrodon halys, sea snakes, viviparous lizards, copper lizards, sharks, crabs and bellied fish are all oviparous animals. In addition, some lizards distributed in the Qinghai-Tibet Plateau of China are also viviparous in the alpine environment, which is the result of the long-term adaptation of animals and the breeding mode formed by the long-term adaptation of animals to the adverse environment.

Oviparity means "hatching eggs in the body", that is, fertilized eggs produced by fertilization in an animal remain in the reproductive tract of the mother, develop into larvae through the yolk of the egg itself, and are not born until the embryo is fully developed. As soon as it matures, the reproductive tract of the mother will contract to expel the larva together with the egg membrane. Therefore, the embryos of oviparous animals are properly protected by the mother, and the hatching survival rate is more secure than that of oviparous animals. In addition to the use of yolk nutrients during the development of fertilized eggs, the exchange of gas and the maintenance of water needed for their development are still dependent on maternal supply. Common oviparous animals include some sharks, peacock fish and bellied fish, as well as some venomous snakes (such as Agkistrodon halys, sea snakes), viviparous lizards, bronze dragon lizards, etc. are oviparous animals.