What kind of animal is a whale and what kind of animal is a whale

Whales are found in all oceans of the world. It is an aquatic mammal that breathes with its lungs, and its species are divided into two categories, baleen cetaceans, toothless, baleen and two nostrils, like fin whales, blue whales, humpback whales, gray whales, etc.; Toothed cetaceans, toothed, without baleen and with one nostril, like sperm whales, narwhals, killer whales, etc. The vast majority of oxygen in the ocean and 60% of the oxygen in the atmosphere is produced by phytoplankton.

Baleen whales, on the other hand, can destroy zooplankton, the archalist of phytoplankton. In addition, toothed whales also help to maintain the ecological balance of the fish. The food of toothed whales is large mollusks that feed on fish.

Therefore, if there are no whales in the world, humanity will perish.

Whales are singers.

The outstanding "singer" in the water should push the "humpback whale". In 1971, American biologists analyzed the vocalizations of "humpback whales" found from the sea and found extremely special sound signals. It turns out that these "humpback whales" emit a series of beautiful and melodious sounds with different tunes.

These sounds lasted for 30 minutes, and then they were sung from the beginning, judging by the degree of melodiousness and lightness, comparable to the singing of birds. French biologists once recorded the "chorus" of hundreds of "humpback whales" in Bermuda at night. There are thousands of sounds out of the whale, including tactful trills, sharp squeaks, roars, buzzes, and squeaks, much like a group of elementary school students who are reviewing their homework loudly and reciting.

The "chorus" is a comparison of the songs sung by a whale over the years, and it is also found that all whales in the same year sing the same song, and the next year is a new one. Every year, when the whale returns to its starting point, it sings the song it sang in the area last year and then changes to a new song. In addition, even though they are far apart, the songs sung by whales in the Bermuda Islands in the Atlantic Ocean and the whales in the Hawaiian Islands in the Pacific Ocean may sound different at first, but a closer look reveals that the structure and changes of the songs are the same.

For example, the songs have 6 themes and have exactly the same sections. The whales in these two places certainly don't come into contact, but the fact that they sing to such the same tune shows that they have an equivalent set of rules within them.

Whales don't get lost in the seas.

Whales never get lost when they swim the sea, because they have a special ability to have more than 100 million tiny cells in their minds that emit ultrasound waves and receive them to orient themselves. They can also use this ultrasound to notify other whales to call for help or run away together in times of distress. This ultrasound can help them swim in the sea without getting lost, and they can also call for help in time.

The various uses of whales are very beneficial to people, and now that a large number of whales are dying, human beings are also going to extinction, and we need to protect cetaceans and let them continue to live and reproduce. Let people make more advanced instruments according to their benefits, whales are friends of humans.

Whales belong to the phylum Chordates, subphylum Vertebrates, Mammalia, and Euzoma, which contain about 80 species of placental mammals living in oceans and rivers.

The order Cetaceans can be divided into two suborders: the baleen whale (mysticeti) and the toothed whale (odontoceti), which are the extant species of the suborder baleen whale and the suborder of toothed whales.

Baleen whale suborder Mysticeti

The suborder Baleen Whale contains the largest extant animal species in the world. There are 3 families and 10 species, all of which are marine.

The smallest species are more than 6 meters long. Toothless in the mouth. There are 150 400 baleen on each side of the upper jaw.

The color, number, and shape of the baleen vary from species to species and are an important basis for classification. 2 external nostrils, located on the top of the head. The head is very large, and some species can reach 1 3 body lengths.

Only 1 2 pairs of ribs are connected to the small sternum, no clavicle, and the flippers are generally 4 fingers. Has a cecum. They use baleen to filter plankton from seawater.

They feed on krill and cephalopods, and some also eat small fish and benthic shellfish.

Odontoceti of the toothed whale suborder

Only a few species of toothed whales are found in freshwater, and most are found in the ocean. It includes more than 80 species in 7 families. (Note:.)

There are some differences of opinion on the suborder of toothed whales, which can be roughly divided into three relatively different groups: dolphins, beaked whales and sperm whales, and each group is divided into one or more families. ）

They vary in size and size. There are teeth in the mouth and only one external nostril. Flippers are generally 5 fingers. With the exception of the Gangese dolphin, there is no cecum. This animal has a unique ability to perceive its environment through echolocation. It feeds mainly on squid, squid, crustaceans, and fish.

Mammals, so not real fish.

Mammal. And it's huge.

Categories: Education, Science, >> Science & Technology.

Problem description stool shouting:

Why whales are not fish.

Analysis: Whales are mammals that live in the ocean. Viviparous, usually one litter 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 viviparous mammals, not fish. Calves need to be fed breast milk for a year to mature. Fish, on the other hand, are oviparous vertebrates.

Broodstock generally do not have the habit of taking care of small fish. The "fins" of the whale are actually evolved from the four limbs. Fish are not.

Whales breathe with their lungs. Fish breathe with gills Whales are homeotherms, whereas fish are ectotherms. It is not possible to distinguish a whale from a fish by the presence or absence of scales.

Whales are cetaceans.

Whales are cetaceans, mainly divided into two categories: baleen whales and toothed whales, their nostrils are long on the top of their heads, and after a period of activity in the ocean, they need to surface to replace oxygen, and cetaceans can only produce one cub per litter, due to human overhunting, a quarter of whale species are extinct.

Whales are marine mammals, the largest animals known to have survived on Earth, can reach 33 meters in length and weigh up to 181 tons, whales generally feed on small crustaceans or fish, and need to forage at depths below 100 meters every day, and are currently mainly distributed in the major oceans between the Antarctic and the Arctic.

1. Marine mammals

Whales are marine mammals and are currently the largest known animals to live on Earth, reaching up to 33 meters in length and weighing up to 181 tons.

2. Eating habits

Whales feed mainly on small crustaceans and fish, usually diving to depths of less than 100 meters during the day to feed, and at night at the surface of the water to feed, Zhengjian Xiaoji can usually consume 2 to 5 tons of Shenhui food a day.

3. Distribution of manuscripts and districts

Whales are distributed in the major oceans between the Antarctic and the North Pole, and whales are used in the four oceans, and there are more in the sea near the Antarctic, while the tropical areas are generally rarely distributed, among which the main distribution countries are Angola, Australia, etc.

Whales belong to the class of mammals, collectively referred to as cetaceans or cetaceans.

Although the whale looks like a fish, it is not a fish, but a type of mammal. Unlike fish, whales are viviparous, generally giving birth to one cub per litter, one litter every two years, and the cubs are raised by the mother's milk. Most of them live in the ocean, and only a few inhabit freshwater environments.

The body shape is very similar to that of fish, and the body shape is streamlined, suitable for swimming, so it is commonly known as whales. The ancestors of whales were semi-aquatic animals 60 million years ago, and gradually evolved into fully aquatic cetaceans. In order to adapt to the underwater environment, cetaceans' forelimbs evolved into fins, and their nostrils moved to the top of their heads, requiring them to emerge from the water at regular intervals to displace oxygen.

Whales are aquatic mammals.

In fact, although the whale looks like a fish, it is not a fish, but a class of mammals, which is similar to the situation of bats that are like birds but are not birds, and are also a class of real mammals. Unlike fish, whales are viviparous, generally giving birth to one litter per litter and one litter every two years. The pups are raised on 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. The whale's body temperature is constant, on average, whether in cold waters or tropical sea areas; Whereas, fish are ectotherms, and their body temperature varies with the change in ambient temperature.

Whales breathe with their lungs and need to surface frequently for ventilation. Fish, on the other hand, use their gills to absorb oxygen dissolved in the water and stay underwater. The similarity in appearance between whales and fish is due to the fact that they have been living together in the same living environment for a long time, which is a "convergence phenomenon".

Characteristics of whales:

The common feature of cetaceans is a constant body temperature, which is: ** Exposed, no body hair, only a few bristles on the tail, 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 trunk of the middle limb. The forelimbs are flake-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. The hind limbs are degenerate, but there are still remnants of the pelvis and femur, and they are fragments of bone.

The tail degenerates into fins, and the ** at the end expands horizontally to form a pair of large tail lobes, but they are not supported by bone, and the vertebrae taper gradually taper at the narrow tail trunk and finally disappear before entering the tail fin. Unlike fish, the tail fin can swing up and down and is the main organ of swimming. Some species also have dorsal fins, which are used to balance the body.

Their bones have spongy tissue, and there is more fat in the body cavity, which can increase the volume of the body, reduce the specific gravity of the body, and increase buoyancy.