VIVIPAR ANIMALS - Examples and characteristics

The viviparity is a form of reproduction present in the Most mammals, commonly referred to as viviparous animals, however, there are also other kinds of animals that carry out reproduction based on viviparity, such as certain amphibians, reptiles and fish.

In this article from Animals and Pets Online you We will explain everything about viviparous animals , starting with the definition, showing you how embryonic development occurs in animals, the characteristics of viviparous animals and, finally, you will also find a complete list with names and examples of viviparous animals that you will be surprised to discover.

What are viviparous animals?

To really know what viviparous animals are, we will begin by reviewing the definition provided by the RAE (Royal Spanish Academy), which defines the adjective " viviparo, ra " of the following form:

An animal said: Stop children in the well-developed phase of fetuses.

Therefore, viviparous animals are those that lead to It carries out its embryonic development in elutero of the parent , receiving through it the oxygen and the necessary nutrients until the moment of birth, when it is considered that they are fully formed and developed.

Embryonic development in animals

But to really understand what viviparous animals are, it is essential to talk about embryonic development, which is the period that passes from fertilization to the birth of a new individual.Yes, in the sexual reproduction of animals, we can differentiate three types of embryonic development :

Viviparos animals : after internal fertilization embryos develop within a structure specialized body of the parent, which protects and nourishes them until they are fully trained and ready for childbirth.
Oviparous animals : in this case there is also internal fertilization, without However, the development of the embryo takes place outside the mother's body, inside an egg.
Ovoviviparos animals : also through internal fertilization, embryos of ovoviviparos animals develop inside an egg, although in In this case, the egg also resides within the body of the parent, until hatching occurs and, therefore, the birth of the offspring.

Discover in Animals and Pets Online characteristics and examples of animals oviparos and ovoviviparos animals.

Types of reproduction of viviparous animals

However, in addition to differentiating between different types of embryonic development, we must know that there are different types of reproduction within viviparous animals:

Placental viviparos : are those that develop within the placenta, an adherent alutero organ that extends during pregnancy to leave room for fetuses.An example would be the human being.
Marsupial viviparos : Unlike other mammals, the marsupials are born without being developed and end up forming inside the marsupium, an external bag that fulfills a function similar to the placenta.The best known example would be the kangaroo.
Ovoviviparos : as we have already told you, it is a mixture between viviparism and oviparism.In this case the parent lays eggs inside her body, where they will develop until they are fully formed The young can be born inside the body of the adre or abroad.

Characteristics of viviparous animals

The placental viviparismo , the one that most mammals carry out, is a more evolved and developed gestation system than the one presented by oviparous animals, since their fetus is gestated within a specialized structure called placenta.In addition to receiving oxygen and nutrients, embryonic development within the parent offers them greater protection with respect to oviparous animals.

Another important feature is that developing viviparous animals lack an outer shell The placenta is a membranous organ that contains a rich and powerful blood supply that wraps elutero of pregnant females.The fetus is fed through a supply line called umbilical cord .The time between Fertilization and the birth of viviparos is called the gestation or pregnancy period and varies depending on each species.

Of the most important aspects among mammals as viviparous animals is the important transition that females suffer after that one egg is fertilized and the gestation or pregnancy period begins.At this stage, elutero increases in size in proportion to the growth of the zygote, and the female begins to experience a series of both internal and external changes in perfect natural preparation of this whole process.The vast majority of viviparous animals are quadruped, this means that they need four legs to stand, walk and move.

Most mammals have a strong and narrow maternal instinct to feed and protect their offspring until they can fend for themselves.The female will know exactly when it will be the moment.In the animal world there is also another form of viviparism, this being the least common.We are talking about the marsupials, as is the case with the kangaroo.

The marsupials are creatures that give birth to their offspring in an immature state and subsequently carry it and breastfeed in the bags they have in their abdomen .The babies remain in this place until they are completely formed and do not need more of their mother's milk to survive.

Examples of viviparos animals-Viviparos mammals

What are viviparous animals? Almost all mammal animals are viviparous, there are only a few exceptions of oviparous mammals, called monotremes whose main representatives are Echidna and 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.

Examples of terrestrial mammals viviparous animals:

Perro
Gato
Rabbit
Horse_
Vaca
Pig
Giraffe
Leon
Chimpance
Elephant

Examples of viviparous animals aquatic mammals :

Delfin
Whale
Sperm whale
Orca
Narval

Examples of viviparous animals-Viviparos fish

Following the article of viviparous animals, we must know some of the viviparos fish , although technically they are ovoviviparos animals.We talk about the species of guppies, platys or mollys:

Poecilia reticulata
Poecilia sphenops
Poecilia wingei
Xiphophorus maculatus
Xiphophorus helleri
Dermogenys pusillus
Nomorhamphus liemi

Examples of viviparos animals-Viviparos amphibians

As in the previous case, viviparous amphibians are not especially common, however, we find them in the order Caudata two representative animals:

Triton
Salamander

Examples of viviparos animals-Viviparos reptiles

To finish our list of viviparous animals we must mention some viviparos reptiles .While most reptiles are oviparos, we also find specific species that carry out viviparism:

Boa ( Boidae )
Sea snake ( Hydrophiinae )
Rattlesnake ( Crotalus )

If you want to read more articles similar to Viviparos animals-Examples and characteristics , we recommend that you enter our Curiosities section of the animal world.

Bibliography

Definition of viviparo, RAE
Cleveland P.Hickman, Larry S.Roberts, Frances Miller Hickman.Integrated principles of zoology.McGraw-Hill Book Company, Inc.

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