I ve heard that whales are mammals, but how do they feed their calves?

Whales are mammals and also feed their calves by suckling. However, since calves do not have lips, whales need to squeeze the milk-producing area to allow calves to eat milk when feeding calves.

Whales are currently the largest animals on the planet, living in the ocean, of course, most people like to call them "whales", but this statement is not true, whales are not actually fish, but mammals.

The difference between a mammal and a fish is not whether it lives in the water or not, but by several of its main characteristics, the main characteristics of the whale are in line with the characteristics of mammals, but there is a significant difference from fish.

Most fish breathe with gills and can breathe directly in the water, although whales can stay in the water for a long time, but whales breathe with their lungs, if the whale has been in the water until the surface of the water to breathe, then the whale will also drown, which is different from most species of fish.

The way of reproduction of whales, the viviparous mode of reproduction adopted by whales, which is a significant feature of mammals, although some sharks also use viviparity, but this viviparity belongs to ovoviviparity in biology, which is very different from the viviparity of mammals.

As mammals, its most striking feature is naturally lactation, which is the most significant feature that distinguishes mammals from other species, and whales nurse their offspring in a lactating way, which is significantly different from all fish, but is the same as mammals.

Although whales have evolved flippers similar to fish in order to adapt to life in the water, this does not mean that whales are fishes, and whales are very different from fish, both externally and in anatomy.

Whales include other aquatic mammals, such as dolphins and manatees, and their tails are paddled up and down, while fish tails are paddled left and right, which is an important difference in appearance.

In addition, whales are also very different from fish in terms of anatomy. Most fish have a swim bladder to control the ups and downs of the fish in the water, which is not the case with this organ. Similarly, fish are the earliest vertebrates, and their body structure is relatively more primitive, and the heart of fish is an atrium and a ventricle.

The mammalian heart has two atria and two ventricles, which is also the difference between whales and fish in anatomy.

Therefore, whales belong to mammals, it is not a type of fish, but because it lives in water, it is generally called "whales".

Because whales are viviparous mammals, while fish are oviparous, whales belong to the category of marine mammals.

Although whales live in water, they are not fish, but a class of mammals. Why is that? Because although they live in the water, some of the key characteristics of whales are the same as those of terrestrial mammals.

Judging by the way they breathe, whales breathe with their lungs; Judging by body temperature, their body temperature is constant; In terms of reproduction, they reproduce in a viviparous manner, and they also have lactation. These are the prominent features of mammals, so they are mammals, not fish.

Whale calves are breastfed, unlike ordinary fish, so they are mammals.

Whales are mammals that need to breathe, so why do they still live in the sea?

Because he is a special mammal, and he is a creature of the ocean, a lot of people like this creature because he needs to live in water, so he is a mammal, but he needs water to survive.

Because of the changes in the earth's environment, whales came to the ocean and began a long evolution, and their snouts gradually evolved to the top of their heads. When they are in the ocean, their nostrils (stomata) are closed, and when they come to the surface, they open their stomata to breathe.

It is because the origin of all living things evolved from the ocean, and whales once wanted to live on land, but due to the influence of natural predators and the environment, they returned to the ocean.

In the process of sleeping, they can't wake up for a while, and go to the surface of the sea for a while to breathe freely. Scientists have found that whales did not live in the ocean at the beginning, about 50 million years ago, because of changes in the earth's environment, whales came to the ocean to start a long evolution, at that time their noses have evolved to the top of their heads, when they are in the ocean, their nostrils (stomata) are closed, only when they surface the sea, will open the stomata and inject fresh air into themselves.

It's because the environment in the sea is very conducive to its growth and reproduction, so it will be in the sea.

In fact, all the creatures on land originated from the sea, but in later evolution, only whales remained in the sea.

It is because of its body structure that allows it to survive well in the sea, and it is very easy to die if it is on land.

Because whales are too large and have not evolved limbs suitable for life on land, this means that land is not suitable for whales, and they can only live in the sea.

Because it can live very freely in the ocean, it may not be able to play on land.

It is because he is a mammal, and in this way he is able to repudiate and promote his breathing.

Because this is a skill that whales bring, we must look at it rationally.

Theory?! Shouting group.

Is this true? How is it a theory!? If you're asking who first spotted whale trapped fluid non-fish......Ancient Greek Aristotle,He observed that whales are viviparous, breathe with lungs, and their fins are different from ordinary fins, which are smooth and scaleless.

So it was concluded that whales are more advanced than fish. But of course, he does not have a taxonomic concept of mammals.

The mammalian seepage was classified, and that was Linnaeus in the 18th century.

Whales have the characteristics of mammals, that is, they have diaphragms in their body cavities, they breathe with their lungs, their hearts are four-chambered, their body temperature is constant, their brains are developed, and they are viviparous and lactating, so they belong to mammals, not fish

Therefore, the answer is: whales have diaphragms in their body cavities, breathe with their lungs, have four chambers of their hearts, have a constant body temperature, have developed brains, and are viviparous and lactating, so they belong to mammals