Whales are found in all oceans of the world. It is an aquatic mammal that breathes with lungs. Its species are divided into two categories: baleen whales, which are toothless, have baleen and two nostrils, such as fin whales, blue whales, humpback whales, gray whales, etc.; toothed whales , with teeth, no baleen, and one nostril, like sperm whales, narwhals, killer whales, etc. Most of the oxygen in the ocean and 60% of the oxygen in the atmosphere is produced by phytoplankton. Baleen whales can destroy phytoplankton's powerful enemy, zooplankton. In addition, toothed whales also help maintain the ecological balance of fish. The food of toothed whales is large molluscs that feed on fish. Therefore, without whales in the world, humans will perish.
Whales are singers
The outstanding “singer” in the water should be the “humpback whale”. In 1971, American biologists analyzed the vocalizations of humpback whales found at sea and discovered extremely special sound signals. It turns out that these "humpback whales" emit a series of beautiful and melodious sounds with different tones. These sounds lasted for 30 minutes, and then started from the beginning. Judging from the cadence, lightness and melodiousness, they were comparable to the singing of birds. French biologists once recorded a "chorus" of hundreds of "humpback whales" participating in the Bermuda Islands at night. The thousands of sounds emitted by the whales include gentle trills, sharp squeaks, roars, buzzes, and squeaks, which are very much like a group of primary school students studying and reciting their lessons loudly. The "Chorus" was first compared with the songs sung by a whale over the years. It was also found that whales sang the same song every year in the same year, and then changed it to a new one the next year. When whales return to their starting point every year, they first sing the song they sang here last year, and then change to a new song. In addition, even though they are far apart, the songs sung by whales from Bermuda in the Atlantic and whales from the Hawaiian Islands in the Pacific seem to be different at first glance. However, upon closer analysis, the structure and change patterns of the songs are the same. For example, some songs have 6 themes and exactly the same phrases. The whales in the two places will definitely not come into contact, but the fact that they sing the same tune shows that there is a set of identical laws within them.
Whales never get lost when they swim in the sea
Whales never lose their way when they swim in the sea, because they have a special ability. There are more than 100 million tiny cells in their heads. , can emit ultrasonic waves and receive ultrasonic waves to orient itself. They can also use this ultrasonic wave to promptly notify other whales in times of crisis to ask for help or escape together. This kind of ultrasonic wave can help them swim in the sea without getting lost, and can also call for help in time.
The various uses of whales are very beneficial to humans. Now that whales are dying in large numbers, humans are also heading towards extinction. We must protect whales and allow them to continue to live and reproduce. Let people create more advanced instruments based on their benefits. Whales are friends of mankind.
Cetaceans are mammals that live in water. They have the same physiological characteristics as land mammals, such as breathing with lungs, viviparous birth, etc., and have some additional features that have evolved to adapt to the aquatic environment. The special physiological structure. Whales are classified into kingdom Animel, phylum Chordata, class Mammrha, and order Cetacea.
Cetacea is divided into two sub-categories: The two orders are suborder Mysticeti (blaleenwhales) and toothed whales (suborder Odo-ntoceti, toothedwhales). The classification of these two categories is mainly based on their differences in feeding methods. The suborder Mysticeti is the main group. The morphological characteristic is that they have no teeth, but they have large baleen, which can be used to filter plankton. Therefore, the main characteristics of the toothed whale suborder are that they have teeth and are predatory. The number and arrangement of their teeth are affected by their feeding habits. There are about 79 species in 13 families in the world.
Although H. fish has the word fish, it is actually not a fish, but a mammal. Many of them are very different from fish. For example, most fish move their tail fins left and right to move their bodies forward, while whales move their tail fins up and down.
They use the flippers at the front to maintain body balance and control force. Some whales also have fins on the upper end of their backs that can keep their bodies vertical!
Whales are social animals. They usually live in groups in the sea. However, when whales breathe, they need to swim to the surface. At this time, whales use the blowholes on their heads to breathe. When you exhale, the moisture in the air condenses to form the familiar fountain shape. Experts can even identify the type of whale based on the height, width and angle of its spray! There are many types of whales, roughly divided into two categories: toothed whales and baleen whales.
There is a very thick layer of fat under the epidermis of the whale, which is commonly known as whale oil. It can keep the whale body warm and store energy to supply emergency needs. Because the whale has many special structures in its body, it can breathe and slow down its heart rate in the water for a long time. Therefore, when it sinks to the bottom of the sea, it will always take a long time before it resurfaces. In addition to having a structure to store oxygen, when a certain part of the body needs a large amount of blood supply, the body also has a special function to centralize the supply!