Why can some animals bark all the time without needing to breathe?

Pulmonary ventilation is the process of gas exchange between the lungs and the external environment. Pulmonary ventilation refers to the process of gas exchange between the pulmonary alveoli and capillaries and the blood. If the ventilation disorder is not serious, it will generally not cause an increase in carbon dioxide in the blood. In the past, people thought that the animal world in water was silent. In fact, that wasn't the case. It was a noisy, noisy world. The symphony played by many aquatic creatures is the source of sound in this world. ?

The world of underwater sound was discovered during World War II. Warships and submarines of World War II were equipped with advanced sonar systems. When exploring underwater sound sources, they picked up various sound waves different from those of enemy ships, which were later revealedbe aquatic animal sounds. ?

Aquatic animals emit various vocalizations. The vocalizations of dolphins and porpoises are frequently studied, and those of sperm whales are well known. ?

Animal behaviorists have discovered that dolphins are animals with good memories and intelligent mouths. Various instruments have been used to record and analyze dolphin vocalizations. They can produce a variety of simple and polyphonic sounds such as "pee", "ktaktak" and "kuzkuz". According to statistics from Dr. Norliss of the Hawaii Marine Research Institute, dolphins emit more than 700 vocal signals, and the vocalizations of dolphins in various sea areas are similar. According to marine zoologist Doliha, dolphins have 31 sets of words and more than 700 pronunciations. ?

Mayarok of the University of Waikat in New Zealand discovered that sperm whales can emit a vvariety of sounds such as "xiu xiu", "snort" and "kachi kachi". Biologists call whale vocalizations “whale songs.” There are two types of humpback whale songs: one is the "social song" when they play and play on the water and the "love song" during the breeding season; the other is the “feeding song” when they are looking for bait; in groups. ?

The smallest unit of whale song is a “bar,” and each bar is made up of many short, intermittent sounds. A song can be sung continuously for 6 to 18 minutes. Whale songs are high-pitched and loud, often ranging from 40 to 1,000 Hz, sometimes reaching 10,000 Hz, and can travel 1,000 kilometers in the water. ?

Sperm whales are generally a "polygamous" group, and who is in this group can be identified by singing. They usually disperse and dive deep to feed. After being nourris, they communicate with each other by singing and everyone comes together again in a group, still the same group. In groups, male whales make sounds to check if female whales are in estrus and encourage them to mate with them. The male who has gained the upper hand speaks out to show his superior position and ask the other males to surrender. The lead male whale makes a sound to announce that the group has occupied a certain area of ​​water and that other groups are not allowed to enter without permission. This proves that whale vocalizations and their usefulness are diverse. ?

Professor Miao Bagu, a marine biologist at the University of Miami in the United States, has made new advances in the study of fish vocalizations. He first understood several words for the premium fish: “chirp,” meaning the male fish is courting; “nupu”, which means that the female is about to lay eggseggs and “boom,” which means the threatening sound of competition; other fish for the territory. ?

The duration of vocalizations of various aquatic animals also varies. The shortest is only half a second and the longest can be up to 18 minutes. Its sound wave frequency varies from Ultrasound frequencies range from 7 to 15,000 Hz, and some even reach 75,000 Hz. ?

The dolphin's vocal cords are not very developed, and the high-frequency sound is its rumbling sound. nasal. The sound that comes from the nasal tube is a “kachkach” sound.