A little knowledge about dolphins

Dolphins are small to medium whales. It is about 1.5~ 10 m long and weighs 50~7000 kg. Males are usually bigger than females. Most dolphins have unique head characteristics. Because of the existence of bean-like fat, the forehead before the beak is raised, also known as "forehead bulge" This structure helps to collect echolocation and foraging sounds.

Although some dolphins have long foreheads, their beaks are short, and the raised foreheads only outline a square appearance. Most dolphins are smooth and have hooked dorsal fins (among other forms). Some dolphins have striking color patterns on their bodies, while others are monotonous colors.

Dolphins don't dive as long as other whales. Swim fast, with the characteristics of juggling. Dolphin swimming is a unique swimming way for dolphins. The whole body jumps out of the water at a small angle and then enters the water at a small angle, which is one of the ways that dolphins are different from other cetaceans (porpoises and other cetaceans generally don't swim in this way).

Dolphins swim very fast, usually the fastest speed is about 30-40 km/h, and the speed of some kinds of dolphins can exceed 55 km/h, which can last for a long time. They are champions of long-distance swimming in the ocean.

As mammals, dolphins have many characteristics similar to humans. However, because dolphins live in the ocean and are different from human land environment, their birth methods will be slightly different. When young dolphins are born, their tails come out first, while human babies come out first. Female dolphins usually have to be pregnant 1 1 month to give birth to calves.

Extended data:

Overview of species

1, bottlenose dolphin

Bottlenose dolphins, also known as bottlenose dolphins, bottlenose dolphins, bottlenose dolphins and giant dolphins. Widely distributed in temperate and tropical oceans such as Atlantic Ocean, Indian Ocean, Pacific Ocean, Mediterranean Sea, Black Sea and Red Sea. , and often active in the shallow sea area near the land. Bottlenose dolphins are friendly, lively and curious. Bottlenose dolphins are relatively safe under current living conditions. However, due to climate change or human hunting and environmental pollution, the survival of a single population is also threatened.

2. Short-nosed dolphins

Short-nosed dolphin, also known as dolphin or puffer fish, is a kind of dolphin scattered in the Bay of Bengal and the coasts and rivers of Southeast Asia. They swim slowly, but the maximum speed is 20-25 kilometers per hour. Dolphins mainly feed on radial fin fish and fish eggs, cephalopods and crustaceans. They can suck food with their mouths.

3. Gray Dolphin

Gray dolphins are distributed in tropical to temperate waters all over the world and usually move in deep water. They mainly feed in the mixed area of offshore and offshore, especially in the water layer between 600 and 800 meters. Their diet includes small squid, fish, krill, crustaceans and cephalopods, and the main food is large octopus.

4. Real dolphins

True dolphins, also known as short-nosed true dolphins and common dolphins, belong to the genus Dolphin of Dolphinidae, and are mostly found in tropical to temperate waters. They usually take dozens or hundreds of fish as a group, are highly attached and move quickly, and feed on fish and squid, especially fish swimming in groups.

5. Freund's dolphin

Freund's dolphin is the only animal belonging to the dolphin family Dolphinidae, mainly distributed in the deep Pacific Ocean, but it also appears in the Indian Ocean and the Atlantic Ocean, mostly in tropical waters. Typical of this species is Borneo. Dozens to hundreds of heads swim in groups, even thousands. Feeding on fish, shrimp, crustaceans and squid.

Baidu encyclopedia-dolphin