Animals are classified by different factors, and one of them is by the way they reproduce. In this case it is about oviparism, that is, animals that come into the world from eggs . The word oviparous comes from the Latin ovum , which is equivalent to egg, and pariré , which means to give birth, and is defined as animals that lay their eggs in an external environment so that the embryonic process is completed until the offspring break the egg shell and are born.
Birds are oviparous animals, and also some other reptiles, like most invertebrate animals and even two species of mammals . The progress of embryos from eggs constitutes a way of self-growth.
When the environment is dry and terrestrial, oviparous females, after developing internal fertilization, lay dry eggs, and the species that are characterized by this are insects, most reptiles and birds . Other animals, such as fish, usually lay soft eggs since they live in humid terrain such as water, in this case, the female lays the eggs and then it is the male who causes fertilization.
Depending on one species or another, the female can lay more or fewer eggs, for example, species that are in a humid environment can lay hundreds or thousands , another case is that of birds, their eggs require a warm temperature for development. of the evolution of the embryos can be carried out in a normal way.
Examples of oviparous animals
Many of the species of the animal kingdom are within the invertebrate animals and these are classified as oviparous sexual reproduction although there are some species that are classified as oviviparous.
These animals are determined by having gill respiration in their larval phase and pulmonary respiration in their adult phase, since they undergo a modification known as metamorphosis. Most amphibians are oviparous, they lay soft eggs in a moist environment , for example the macaw frog or toad.
They have a great power of knowing how to fly, although not all of them, they are also species with oviparous sexual reproduction, which after internal fertilization and being in dry earthly environments lay eggs protected by a shell .
Mammals are related to viviparity but there are two species that are out of the ordinary, they are the platypus and the echidna , which have a mixture of characteristics of some birds and some mammals.
Vertebrate animals that live in an aquatic environment, and most of them are oviparous, for example salmon or gourami, and others like the shark are oviviparous, that is, animals that persist in the mother’s body until it breaks. the shell and then they are born alive,. The male is the one who proceeds to fertilization, once the female has placed the eggs in a humid environment.
Reptiles classified as vertebrate animals, are a transformation of past amphibians, which were accommodating their skills to life on land. Most of this animal kingdom are oviparous, for example, the crocodile or the rattlesnake.