Dolphins have always been one of mankind's favorite marine animals! Dolphins have smooth, hairless skin and are good at jumping and snorkeling. How much do you know about dolphins? What is its living habit?
Knowledge about them.
There are more than 40 kinds of dolphins. Most dolphins live in the sea, but there are also "freshwater dolphins" that live in freshwater rivers.
The smallest and rarest dolphin in the world is in New Zealand. Hector's dolphin is the smallest dolphin in the world at only 1.5 meters long.
Maui dolphins are the rarest dolphins in the world.
The largest dolphin in the world is the killer whale. Killer whales can grow up to 9 meters in length, almost as big as a bus!
Dolphins make different sounds for echolocation in order to find food and communicate with their companions. There are three main types of sounds: whistles, sonic pulses, and ticks.
Dolphins can make sounds up to 200kHz. The maximum range of sound vibrations that humans can hear is 20 kHz. The real dolphin sound is inaudible to humans~
It mainly feeds on fish, shrimp and squid.
Like other toothed whales, dolphins rely on echoes to locate their prey and can even stun them with high sound levels.
Dolphins swim very fast, usually the fastest speed is about 30~40 kilometers per hour, individual dolphins can exceed 55 kilometers per hour and can last for a long time. They are the long-distance swimming champions in the ocean.
Some dolphins are highly social species, living in large groups, sometimes consisting of more than 100,000 dolphins, and exhibiting many interesting collective behaviors.
Members also work together to rescue injured or sick dolphins.
In the process of breathing, dolphins need to get out of the water and cannot stay in the water all the time, otherwise there is a risk of drowning.
When dolphins breathe, they use their nostrils and mouth to expel air from their lungs and then inhale fresh air.
Every so often, dolphins need to touch the surface of the water to breathe.
There is also a unique way of communication between dolphins. It can not only make different sounds, but also express different meanings through the air bubbles in the water.
They also used body language, jumped out of the water, bit their jaws, and even hit their heads.
The blue ocean gave birth to human life, and marine animals are closely related to the survival of human beings.
Like many marine animals, dolphins face various threats due to human activity, and some species are even endangered.
Some things belong to the sea, even though we may never encounter it in the sea.
It is our responsibility to protect the cute it!