What are the oviparous mammals? What are the oviparous mammals

First of all, mammals refer to a class of vertebrates with mammary glands that can produce and nurse young, including pigs, dogs, cats, sheep, horses, bats, etc. Of these, the vast majority of mammals are viviparous, that is, their young develop inside the mother's body and inherit the characteristics of the mother directly after birth.

However, there are also some mammals that are not viviparous. These mammals lay eggs and hatch them outside the body, and the young enter independent life by crawling or being chewed by their mothers after hatching. However, the number of these oviparous mammals is very small, and the only common ones are platypus and echidna.

The platypus is a semi-aquatic mammal with a beak like a duck's beak, the platypus looks quite like a duck, but the duck is oviparous and it is a mammal. Echidna rats are mammals endemic to Australia, and they are large and covered with spines, making them look like hedgehogs. They are oviparous mammals.

Thus, although very small in number, echidna and platypus are the only two animals of oviparous mammals.

Yes. Oviparous mammal – platypus.

This monster with the body of a beast but the beak of a duck, even Engels admitted his mistake to it. In 1843, Engels saw the egg of a platypus in England. People told him:

This is a species of mammal that lives in Australia. Engels laughed when he heard this: mammals are viviparous, and platypuses are oviparous.

There are platypuses and echidnas.

1. Platypus: It is one of the most primitive mammals, it is an incomplete mammal, with very few species, and there is only one animal in the same genus, and it is also one of the lowest mammals.

2. Echidna: a general term for echidnas. It is one of the most primitive mammals and looks like a hedgehog.

Adapted to ant-eating life, it inhabits rocky, sandy and shrubby areas, and lives in crevices and self-digging burrows.

Oviparous mammals:

Oviparous mammals are ancient species that are a special case left over from the transition period when oviparous animals evolved into viviparous animals. Although they are not viviparous, these animals are still mammals because they have a series of viviparous characteristics due to their innate mammalian behavior, body surface coat and other characteristics.

1. The way of reproduction is different.

Oviparous animals reproduce by hatching eggs, while mammals reproduce by hatching eggs. For example, frogs, chickens, etc., they are bred in vitro; Mammals, on the other hand, reproduce in viviparity, and nurture their offspring in their bodies.

2. Different breathing patterns.

Mammals breathe with their lungs, like whales, while oviparous animals breathe with gills, like fish.

3. The characteristics are different.

Mammals have fur and are homeothermic animals, such as whales, that do not hibernate, whereas oviparous animals are ectotherms, such as snakes, hibernate in winter.

Mammals have more developed brains and can therefore produce more complex behaviors than other animals, but note that the platypus is a mammal, but it is oviparous, so it is an inferior mammal.

Viviparous species. Mammals: bats, finches, fur seals, dolphins, baboons, pangolins, foxes, anteaters, sea otters, humans.

Oviparous species. In addition to some mammals (platypus, echidna), others such as: lizards, dinosaurs, crocodiles, frogs, fish, birds, chickens, ducks, geese, ostriches, crocodiles, turtles, penguins, etc.

Viviparous animals must be mammals.

But mammals are not all viviparous, some are oviparous, such as the platypus in Australia.

The larvae of humans or some animals do not leave the mother's body until they have developed to a certain stage in the mother's body, and this reproductive method is called viviparity. The embryonic development of viviparous animals depends on the mother's nutrition.

Are all viviparous mammals?

Viviparity and lactation ensure a high survival rate of offspring. Viviparity provides protection, nutrition and stable thermothermal development conditions for the developing embryo, which can ensure the normal progress of enzyme activities and metabolic activities, and minimize the adverse effects of external environmental conditions on embryonic development. and amniotic fluid in the womb.

It can reduce the impact of vibration on the fetus.

Mammals.

It belongs to the homeothermic animal. The fur on the body surface of mammals helps maintain body temperature. All mammals have bones and have fur that breathe with their lungs.

Almost all mammals are viviparous. All mammals need to be fed breast milk by their mothers in their infancy. Viviparity, lactation, and constant temperature are the three major characteristics of mammals.

Birds, reptiles, and most fish and insects are almost oviparous. For example, chickens, ducks, fish, frogs, turtles, butterflies, etc. are all oviparous animals. After laying eggs (eggs), oviparous animals hatch and become animals, and their nutrition comes from the eggs themselves.

Viviparous animals: bats, seals, fur seals, dolphins, baboons, pangolins, meerkats, anteaters, sea otters, domestic animals, felines, rodents, primates, monkeys, tigers, cows, sheep, wolves, etc., are all viviparous.

In general, birds, reptiles, insects and other animals are oviparous, such as swallows, butterflies, turtles, chickens, eagles and other animals, in addition, a very small number of mammals, such as platypus, etc., are also oviparous. Mammals are generally viviparous, such as cows, sheep, horses, cats, dolphins, baboons, etc.

Mammal. Are there any oviparous ones? What are the oviparous mammals? Why are they oviparous?

We all know reptiles.

Animals and birds lay eggs first and then hatch the animals in the eggs, and animals like this we call oviparous.

There is also a variety of animals, they all reproduce their offspring through viviparity, such as humans, such animals are called mammals. But there are a few animals that are special, it lays eggs and hatches, but it is a mammal. Ay?

Some people ask, why do mammals lay eggs and hatch eggs? Isn't it viviparous?

It turns out that this mammal that lays eggs and hatches eggs is called oviparous mammals. Oviparous mammals, in the long history, in the process of evolution from oviparous animals to viviparous animals, there was a little accident, they did not fully evolve the reproductive aspect, and they also needed to lay eggs and hatch eggs. Animals like this exist in the form of echidnas and platypus.

They are single-hole animals, and platypus are more familiar, that is, animals that look like ducks and have flat beaks.

Echidnas are also sometimes referred to as spiny anteaters.

In the order monofora of oviparous mammals, it belongs to the family Parasyticidae. The four extant species, along with the platypus, are the only surviving species in the order Monoforre and one of the mammals that can lay eggs at present. Some species of food consist of ants and termites, but they are not closely related to American anteaters.

Echidnas live in Australia and New Guinea.

Apparently evolved from an aquatic platypus-like monomorphus between 20 and 50 million years ago, this echidna adapted to life on land. So this animal is considered to be both a mammal and a reptile.

characteristics. <>

There are only three types of oviparous mammals, which belong to the class Mammals.

Protozoa, monoporeEchidnidaewithPlatypusBranch

Among them, there are two kinds of echidnasEchidna short-nosedofEchidna long-snout, each with two subspecies. There is only one species of platypus, and that isPlatypus