You may have heard the name "Chinese white dolphin" many times, but how much do you know about this animal? In fact, their official name is "Indo-Pacific humpback dolphin" and their scientific name is Sousa chinensis. "Chinese White Dolphin" is just a place name given to them by Chinese mainland and Hongkong people. Chinese white dolphin is one of more than 80 cetaceans in the world. Taxonomically, it belongs to the dolphin family of cetaceans, and is closely related to bottlenose dolphins and even killer whales. Dolphins look like fish, but in fact they are all mammals like us. They will get pregnant, have children, nurse their children, keep them warm and breathe with their lungs! Chinese white dolphins are on the verge of extinction? This is a long-standing saying. Since the mid-1990s, many media in China and Hongkong, and even environmental groups, have said that Chinese white dolphins are endangered species. At that time, an environmental group pointed out that Chinese white dolphins would be extinct in the Millennium! In fact, according to the IUCN Red List of Endangered Species, the authoritative organization for identifying species status, Chinese white dolphins still belong to the category of "lack of information". In other words, there is still not enough evidence to show whether the Chinese white dolphin is endangered. At present, no one studies Chinese white dolphins in many countries where they live, so no one knows how many Chinese white dolphins there are in the world. Photo reference: AFCD/misc/dolphin/images/nl1_ 260199 _ 2 _ SNL11photo reference: AFCD/misc/dolphin/images/. 2 _ 06197 _1_ snl12nl37 _190897 _ 2 _ sl37 picture reference: afcd/misc/dolphin/images/nl46 _ 030504 _ _ NWL _ SL46 picture reference: afcd/misc/dolphin/images/nl59 _ 050898 _ 2 _ sl59 picture reference: afcd/misc/dolphin/images/nl60 _ 080198 _ 2 _ 65438+misc/dolphin. Images/nl123 _100203 _1_ 2 _ NWL _ SNL123 picture reference: afcd/misc/dolphin/images/nl139 _/kloc. Kloc-0/ _ NWL _ SNL 139 Picture reference: AFCD/MISC/Dolphin/Images/NL66MISC/Dolphin/Images/NL145 _ 310702 _12 _ 45 picture reference: afcd/misc/dolphin/images/nl149 _10203 _ 2 _ wl _ SNL149 picture reference: afcd/misc/dolphin/images/nl149.

Dolphin is an aquatic mammal, related to whales and porpoises. It usually lives in the sea, and some live in rivers (such as the baiji in China). It uses ultrasound to transmit information and its brain is highly developed. There are two hemispheres that can take turns to rest, so dolphins don't need to sleep. The name dolphin in English comes from the ancient Greek word Δ ε λ φ (Delphi, meaning "having a uterus"). That is, "fish with uterus". The word dolphin has the following different definitions: any member of the dolphin family. (marine dolphins. Any member of the freshwater dolphin superfamily (marine dolphins and freshwater dolphins) belonging to the Phallidae and the Freshwater Dolphinidae, and any member of the odontidae (including the above two families and some other whales) belonging to the odontidae. Laymen usually think that this word is synonymous with bottlenose dolphins. Bottlenose dolphins are the most common species in the dolphin family. In this paper, we adopt the definition of the second item above. Therefore, under this concept, porpoises (odontidae) do not belong to dolphins. Killer whales and some related whales belong to the dolphin family, so they are classified as dolphins. Even though we call them "whales" in everyday language. At present, there are about 40 species of dolphins belonging to the genus 17 in the world. They vary greatly in size. The smallest is the dolphin in Maui, 1.2m, 40kg, and the largest is the killer whale, 9.5m, 10t. Most species of dolphins usually weigh between 50 and 200 kilograms. They are found all over the world, but they often appear in shallow waters and near sandbars on the mainland. Dolphins are carnivores and usually feed on fish and squid. Dolphinidae is the most diverse family in Leo. They evolved from the Miocene of Tertiary about 1 100 million years ago. Evolution of Dolphins Dolphins, as well as whales and porpoises, all evolved from terrestrial mammals. It is considered to be a species similar to Artiodactyla. In the present dolphin skeleton, two rod-shaped bones located in the pelvis are considered as degenerated hind limbs. About 50 million years ago, they returned to live in the sea. See cetacean evolution for details. There are many legends about dolphins, some of which are true. For example, the Greek historian Rottustu recorded such an incredible story in his book The Legend of Aryan: Aryan was a famous lyric poet and musician in the 6th century BC and lived on the island of Lesburg. After visiting Italy, he returned to Corrington by boat with a lot of money. On the way, the sailors were jealous of money and wanted to kill him for it. At that time, Aryan asked him to sing another song, and the sailors agreed. Who knows, his beautiful singing has attracted countless sea behemoths! After he was thrown into the sea, one of them took him to the shore. This mysterious animal is the famous dolphin. Even in modern times, incidents of dolphins saving people have occurred frequently. For example, Natural History, published by 1949, published a story about a lawyer's wife in Florida, USA, who was unconscious after being submerged by seawater. Just when life and death were at stake, a nearby dolphin pushed her to the beach. According to fishermen's legend, if dolphins swim on the shore, it will be calm that day, but two days later, there will be strong winds and waves on the sea, and fishermen can't go to sea. Therefore, fishermen regard the sudden appearance of dolphins as an ominous sign. Therefore, a large number of dolphins were killed, resulting in a rapid decline in the number of dolphins. In the dolphin family, there are six kinds of animals that are usually called "whales", but strictly speaking, they belong to dolphins. Melon whale

Black calf whale

Killer whale. Chinese name: dwarf black whale

Fake killer whale, fake black whale

A long-finned sperm whale, a long-legged sperm whale.

Black brain tumor. Chinese name: short fin sperm whale, round head whale, Atlantic sperm whale.

Bat with big beak and round head. Chinese name: round-headed whale or Pacific pilot whale 2007-12-0816: 22: 02 Supplement: Three most endangered dolphins in the world: Chinese white dolphin.

Finless porpoises are the same as whales. ......

Reference: myself

The chinese white dolphin - sousa chinensis

Finless porpoises are the same as cetaceans. "

Reference: dcs/