Information about whales, up to 100 words

1. Whales are divided into two categories, one is baleen whales and the other is toothed whales. The cetacean genus is a subphylum of mammals, including about 98 species of viviparous mammals living in oceans and rivers.

2. There are more than 30 species in China's waters. All species of whales inhabit the ocean, with the exception of a few that live in freshwater. The definition of the whale itself is vague, and the whale can encompass all cetaceans, as well as specific families of cetaceans.

3. All dolphins are also included in the whales. There are two main species of whales: baleen whales (mysticeti) and toothed whales (odontoceti).

There are few species of baleen whales, but they are huge, and the smallest species known to be more than 6 meters long, and the largest animal in the world, the blue whale, also belongs to baleen whales.

4. However, the body shape of toothed cetaceans varies greatly, with the smallest species only about 30cm in length, and the largest sperm whale in length of more than 20 meters. Whales do not belong to the class of fish, but to the class of mammals.

Although the whale looks like a fish, he is not a fish, but a mammal, and he breathes with his lungs.

Whales are small mammals that breathe with their lungs.

Whales are mammals and breathe with their lungs.

Whales vary greatly in size, from small ones to about 6 meters in length, to the largest to more than 30 meters, to the heaviest weighing more than 170 tons, and the lightest weighing up to 2,000 kilograms. Whales, although they look like fish, are not fish, but are a class of mammals, similar to the situation of bats that are like birds but are not birds, but are also a class of true mammals. Unlike fish, whales are viviparous, generally giving birth to one litter per litter, and the cubs are raised by the mother's milk; Fish are oviparous and can lay thousands of eggs at a time, and once hatched, young fish can live independently without lactation.

Think for yourself, don't rely on others for everything.

Male and female killer whales differ in appearance (upper male and lower female).

Killer whales are extremely stout and are the largest species in the class delphinidae family. The head is conical and does not have a protruding beak. The large, towering dorsal fin is located on the back** and has a high degree of variability in shape, with females and non-maths.

Killer whales ** Admire (18 photos) The dorsal fin of the killer whale is sickle-shaped, while the adult male whale is mostly upright like spines, with a height of about 1 to 1 meter. The pectoral fins are large, broad, and roughly rounded, unlike the sickle-shaped pectoral fins typical of most members of the dolphin family. There are 10 to 14 pairs of large, sharp teeth in the upper and lower jaws, each of which is about 8 cm in size.

In the shallow waters of the bay, it also likes to hook the seaweed with the notch on its tail to make a "whirring" sound, and soon it is covered with translucent seaweed. [1]

The killer whale is a large toothed whale, with a length of 8 10 meters, a weight of about 9 tons, a black back, a grayish-white belly, a pointed dorsal fin, the dorsal fin is curved up to 1 meter, the mouth is slender, the teeth are sharp, the temperament is fierce, carnivore, good at attacking prey, is the natural enemy of penguins, seals and other animals. Sometimes they also attack other cetaceans, even great white sharks, which can be called the overlords of the sea.

Cetaceans belong to the phylum Chordates, subphylum Vertebrates, Mammalia, and Eumatrics, which contain about 98 species of viviparous mammals living in oceans and rivers. There are more than 30 species in China's waters. All species of cetaceans inhabit the ocean, with the exception of a few that live in freshwater.

The whale is a mammal that lives in the sea, don't look at us calling him a whale, he is a fish, but evolved from the road place, because it looks like a fish, so everyone calls him a whale.

There are many types of whales, which can be divided into two main groups: one baleen whale and the other toothed whale.

The tongue of a whale weighs more than 10 large fat pigs.

The size of the giant whales in the ocean varies greatly, from small whales measuring only about 1 meter in length to the largest being more than 30 meters. Most of them live in the ocean, and only a few species inhabit the freshwater environment, and their body shape is very similar to that of fish, and their body shape is streamlined, suitable for swimming, so they are commonly known as whales, but this similarity is just a convergence phenomenon in biological evolution. Because cetaceans have the characteristics of viviparity, lactation, constant temperature, and respiration with lungs, they are completely different from fish, so they belong to mammals.

Whales in the ocean.

Whales are mammals and are the largest animals in the ocean. The whale has a large body, the largest can reach more than 30 meters in length, and the smallest is more than 5 meters. At present, the largest known whale weighs about 160,000 kilograms, the smallest is also 2,000 kilograms, and a whale weighing nearly 40,000 kilograms has been found in China, about 17 meters long.

The whale's body shape resembles that of a fish, which is fusiform-shaped; The head is large, the eyes are small, and the pinna is completely degenerated; The neck is not obvious; The forelimbs are fin-shaped, and the hindlimbs are completely vestigial; Most species have fins on their dorsal backs; The tail is horizontally finned and is the main locomotor organ; toothed or edentulous; one or two nostrils, long on the top of the head; hairy on the side of the mouth (a few hairless); **There is a thick layer of fat underneath that keeps the body warm and reduces the specific gravity of the body. Breathe with your lungs, inhale at the surface of the water and dive into the water, where you can dive for 10 to 45 minutes. It generally feeds on plankton, molluscs, and fish.

Viviparous, usually one son per litter, feeds the calves with milk. But many people refer to them as fish, when in fact they are not fish but mammals. It is found in the world's oceans.

Whales are very poor at reproduction, giving birth to a calf on average every two years. Due to human hunting and pollution of the marine environment, the number of whales has decreased dramatically. For example, the largest of the cetaceans, the blue whale, which had nearly 360,000 killed in the 20th century, and now there are less than 50 whales left, and many species of whales that have lived on the earth for more than 50 million years are on the verge of extinction.

Whales, belonging to, phylum Chordates, subphylum Vertebrates, Mammalia, Subclass Euzoa. Whales are mammals, the largest animals in the ocean, whales look similar to fish, have a streamlined body shape, and are suitable for swimming, but they are not fish, they are viviparous, and they also breathe with their lungs.

Whales look like fish, but they are not fish, but mammals, and they breathe with their lungs and need to surface frequently to breathe. Although whales are mammals, they are perfectly adapted to life in the sea.

The common feature of cetaceans is that the body temperature is constant, about about the same time. Nude, no body hair, only a little bristle on the snout, no sweat and sebaceous glands. The fat under the skin is thick, which maintains body temperature and reduces the body's gravity in water.

The skull is well developed, but the skull is small, the facial is large, and the forehead and maxilla are markedly elongated, forming a very long snout. The neck is not obvious, the cervical spine is healing, and the head is directly connected to the torso. The forelimbs are fin-shaped, the toes are not separated, there are no claws, and the joints of the elbows and wrists cannot move flexibly, making them suitable for swimming in water.

Whales are viviparous and are mammals.

The loveliest thing about whales is when they sleep together and when they breathe.

Whales will always sleep together.

In the evolutionary history of living things, from ancient terrestrial tetrapods to modern aquatic mammals, there has been a missing link. Therefore, scholars believe that the above-mentioned discovery of ancient whale fossils fills this gap. However, why did ancient whales migrate from land to water?

Originally, ancient whales reproduced and nursed their offspring on land, just like today's sea lions, fur seals, seals and other animals. However, the evolution of organisms is often influenced by environmental changes, and about 50 million years ago, because the ratio of food to predators in water was easier for ancient whales to survive than on land, they began to move into shallow seas close to the shore; About 10 million years ago, the descendants of ancient whales evolved to be very similar to modern whales, with long tails, short necks, and hind feet that degenerated into fin-like appendages, and became accustomed to living in the sea, and they no longer came ashore.

Cetaceans are a kind of mammals that live in water, and they have the same physiological characteristics as land mammals, such as respiration with lungs, viviparity, etc., and some special physiological structures evolved to adapt to the aquatic environment. Whales are classified: belong to the animal kingdom, chordates, mammals (class mammrha), cetaceans.

Under the order Cetaceans, it is divided into two suborders, namely the suborder baleen whale and the toothed whale suborder. The main morphological feature of the baleen whale suborder is that it has no teeth, but it has large baleen that can be used to screen plankton, so it is filter feeding. The main characteristics of the toothed whale suborder are toothed, predatory, and the number and arrangement of its teeth will be affected by the direction of diet, and there are about 79 species in 13 families in the world.

The snout of the whale is very short. The back of the body is black or blackish-gray, the abdomen is white, the head and palate are black, and the lower jaw is black only at the snout.

Most baleen cetaceans are found in various bodies of water and migratory behaviour, and toothed whales can also be found in different waters, but most are confined to fairly small areas, such as some dolphins live only in river waters, some only in inshore waters, and some in open water. Some of the families of toothed whales, such as sperm whales and beaked whales, live in open oceans

Lesson 9 of the first volume of Chinese texts for primary school students in the fifth grade.

Whales are giant creatures in the ocean, mammals like dolphins, but they are larger than dolphins, have a shorter mouth, evolved forelimbs with flat fins, vestigial hind limbs, dorsal fins, a wide and flat tail, and a streamlined body shape. There are one or two blosites on the top of the head, and only one stomat in toothed cetaceans. Taxonymically, they belong to the suborder of cetaceans, the suborder of baleen whales and the extinct suborder of ancient cetaceans, and the cetaceans that cannot be classified in the suborder Dolphinidae.

It is widely distributed, and its traces can be seen in about the world's seas, which are oceanic, and the behavior is more group activity, and it is rarely alone, and sometimes it will accompany other species of whales or dolphins to move, forage or play. Such as jumping to hit the waves, whale tail lifting, whale tail hitting the waves, floating and so on.