Examples of Viviparous Animals

Modes of Reproduction

Living beings reproduce by either asexual or sexual means. Offspring produced through asexual reproduction share the same genetic makeup as their single parent because they are all clones of the original parent. In sexual reproduction, the genetic material of both parents is contributed to create a unique offspring. Two types of reproduction modes seen those afre:...

Oviparity (Egg-laying)

Oviparity is a reproductive mode in which females deposit eggs that mature and hatch in the external environment. The oviparous animals can perform internal as well as external fertilization. Depending on the kind of fertilization, the females lay fertilized or unfertilized eggs. In certain oviparous animals, the females retain their fertilized eggs for certain period of time before laying them; allowing the embryos to be in an advanced stage of development upon oviposition. This feature is known as “oviparous egg retention,” where the female normally lays an intact egg which continues to develop in the external environment before it hatches....

Examples of Oviparous Animals

Birds: All the birds lay eggs and sit on them in order to keep them warm and take care until it hatches to give birth to the young one. Amphibians and Reptiles: All the fishes and amphibians lay eggs. All other reptiles are oviparous, with the exception of a few species of snakes. Fishes: Although they also lay eggs, but their eggs are in an unfertilized state since the fishes undergo external fertilization. Mammals: Examples of mammals that lay eggs are echidna and platypus....

Viviparity (Live-bearing)

In contrast, viviparity is a reproductive pattern in which females give birth to offspring that are able to live freely. They do so by retaining developing eggs inside their body. Despite interspecific variations in placental complexity, they possess the capability to maintain eggs in the uterus for the entire process of embryo development, resulting in the production of fully developed offspring at birth. During gestation, the mother gives nutrition to the embryo by the phenomenon known as “matrotrophy.“...

Examples of Viviparous Animals

Marsupial Viviparous animals: They lack the placental system. After the birth of an immature foetus, the mother keeps the baby in specialized pouches for the purpose of protection and feeding. Example: Kangaroos. Placental Viviparous animals: They bears a specialized system that keeps the check on the requirement and protection of the baby inside the mother’s womb. The placenta remains attached to the lining of mother’s uterus and provides the nutrients through the bloodstream. Example: Humans. Ovoviviparity: It is the blend of oviparity and viviparity where the female bears the eggs internally. And once after the maturation of the baby is complete, the young one hatches inside the mother’s womb and then it is delivered outside. Examples: Sea horses, ray fish, etc....

Embryonic Nutritional Patterns

Animlas can also be categorised based on the way in which the embryos receive nourishment. In most animals, the yolk of the egg contains nutrients necessary for growth. “Lecithotrophy” is the name used to describe this feeding pattern in embryos: The Greek term lecithos means “yolk.” This pattern differs from “Matrotrophy,” when the female supplies nutrition for the development of the foetus through a placenta (“placentotrophy”) or some similar structure....

Comparison between Oviparous and Viviparous animals

Basis of Comparison Oviparous animals Viviparous animals Meaning They lay eggs. They give birth to young one. Lay or Give birth They lay eggs, which can be fertilized or unfertilized. They directly give birth to the young ones. Type of fertilization Internal or external Internal Nutrients to the developing embryo The embryo receives the nutrients from the egg yolk i.e., Lecithotrophy The embryo receives the nutrients from the mother i.e., Matrotrophy Site of Development Egg development occurs in the external environment after oviposition. Eggs develop inside the body of the maternal parent. Extent and Time of Development Inside the Female Embryonic development usually takes place in the external environment. Oviparous animals have shorter gestation periods than the viviparous animals. Advantages No space constraints restrict the size of the litter. A viviparous female may protect her developing eggs from environmental variations as well as biotic and abiotic stresses. Disadvantages Eggs might be exposed to predators, flooding, microbial attack, UV light and temperature extremities. The efficiency of a female to roam around is compromised during pregnancy, which affects the survival of both the mother and the foetus Examples Insects, amphibians, fish, reptiles, birds. Almost all mammals like cats, dogs, humans, elephants, lions, tigers, etc....

Stages of Embryo Development

Emrypo development stages are given below:...

Metamorphosis in Oviparous Animals

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Conclusion

After going through the above article, we can conclude that both the reproductive strategies namely Oviparity and Viviparity are equally important and play a very dynamic role in reproduction. Also, we can say that the ultimate aim of each and every organism is to increase the number of its species. We also came to know the basic differences between oviparous and viviparous animals and their distinct reproductive strategies....

FAQ’s – Viviparous and Oviparous Embryo development

1. What do you Understand by the term Viviparous?...