Dolphins are highly intelligent creatures with self-awareness. They are conscious and understand emotions. They can predict what is about to happen by observing what is in front of them, and they can communicate with people.

Dolphins are animals that keep a "smile", which is actually formed by the unique structure of the dolphin's face. That smile makes you think they're happy all the time.

Dolphins have always been one of mankind's favorite marine animals. Did you know this about dolphins?

1. Dolphins heal quickly and return to their original shape after severe trauma.

2. Dolphins also play with animals, they sometimes drag birds underwater but don't eat them. For the dolphins, it might just be a game.

3. Dolphins sleep with one eye open, they never stop watching and listening to changes in their surroundings.

4. Dolphins, whales, and apes are the three known suicidal animals besides humans, with females having a higher suicide rate.

5. Dolphins can recognize their old friends after 20 years of separation. When dolphins encounter friends or potential enemies, they are quick to judge.

6. Dolphins help people who are injured or drowning, they are helpful and can be very close to people.

7. 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.

8. The smallest and rarest dolphin in the world is in New Zealand. Hector's dolphin is the smallest dolphin in the world only 1.5 meters long.

9. The Maui dolphin is the rarest dolphin in the world.

10. 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!

11. 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.

Do you know why dolphins are so smart?

Because dolphins have two brains, they are as smart as humans.

It sleeps with one eye open and the other closed, with two brains working separately and very alert. Only in this way can the danger be avoided as much as possible.

Such an intelligent animal faces many threats at the same time.

Noise.

Cetaceans such as dolphins quickly rise from the depths of the ocean after being startled. Once in unfamiliar shallow water, it can lead to stranding.

Toxic chemicals.

Certain chemicals can cause hearing loss in dolphins, which in turn can cause animals such as dolphins to crash into boats or run aground.

Marine litter.

Bottles, plastic bags. The number of garbage people throws into the ocean is enormous.

Large pieces of litter, such as large plastic bags and fishing nets, pose a threat to large marine life such as dolphins and sea turtles, which can become entangled and suffocate to death.

We have to know how to protect it.