Livviparous animals – Examples and characteristics
Viviparity is a form of reproduction found in most mammalian creatures, in addition to some reptiles, fish and amphibians. The viviparous animals give birth to juveniles that were fed and developed in direct contact with the bodies of their mothers. Even human beings are viviparous animals.
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After a female mating or having a sexual union with the male of the same species, a new being can be created, which at the end of a gestation process will inherit the characteristics of its parents.
Keep reading this article from the Animal Expert where we show you viviparous animals with various examples and characteristics .
1- Livparts differ from oviparous animals that lay eggs “outside”, such as most birds and reptiles. The viviparous animals have a more developed and developed gestation system than the oviparous ones, called placental viviparism, that is, those animals whose fetus is formed inside a “placenta” pouch inside the mother until she is mature enough, big and strong to be born and to survive by itself out of the body.
2- Another important characteristic is that the eggs of viviparous animals lack a hard outer covering or of shell like the hen’s egg or other animal viviparous. In many cases, developing fetuses of viviparous animals are connected to a placenta in the mother’s body, which is a kind of egg. The placenta is a membranous organ that contains a rich and powerful blood supply that surrounds the uterus of the pregnant females. The fetus feeds through a supply line called the umbilical cord . The time between fertilization and the birth of the viviparous ones is called the period of gestation or pregnancy and varies depending on each species.
3 – Of the most important aspects among mammals as viviparous animals is the important transition that females suffer after an ovum is fertilized, where they begin the period of gestation or pregnancy. At this stage, the uterus increases in size in proportion to the growth of the zygote, and the female begins to experience a series of changes both internal and external in perfect natural preparation for this whole process.
4 – The vast majority of viviparous animals are quadrupeds, this means that they need four legs to stand, walk and move.
5. Most mammals have a strong and narrow maternal instinct to feed and protect their offspring until it can survive on its own. The female will know exactly when this moment will happen.
6. In the animal world there is also another form of viviparism, which is less common. We are talking about marsupials, as is the case with the kangaroo. The marsupials are creatures that give birth to their offspring in an immature state and later host the chicks in the pouches that have in their abdomen where they breastfeed them. The chicks remain in this place until they are fully formed and do not need more milk from their mother to survive.
Examples of viviparous animals
– Viviparous mammals:
Almost all mammalian animals are viviparous, there are only exceptions of oviparous mammals, called monotremates whose representatives are the echidna and the platypus. In this group we must also include marine species such as dolphins, whales and narwhals, as well as the only species of flying mammal: the bat. Special among all the animals in the world.
The most common viviparous are most domestic animals: the dog, the cat and the rabbit. Those considered farm animals: horses, cows, pigs. And among viviparous wild animals we have the giraffe, lions, chimpanzees and elephants.
– Live viviparous fish:
So far, many species of viviparous fish have not been discovered, but to our surprise there are some such as guppies and molinos .
– Living Amphibians:
There are also not many viviparous amphibians, however, we have a couple of exceptions like the newts and salamanders .
– Viviparous reptiles:
Although most reptiles are oviparous, in this group of viviparous, there are only certain species of lizards and snakes (jiboias, sea snakes, rattlesnakes, among others).