Whale is the name of cetaceans in marine mammals, and is divided into toothed whales and baleen whales, including dolphins under cetaceans.

Whales have an extremely thick layer of fat under their skin, called whale oil, which keeps the whales warm and stores energy for emergencies.

Whales include sperm whales, killer whales, blue whales, and gray whales.

The blue whale is the largest.

The blue whale has a slender body and a bluish-grey back, although it can sometimes appear lighter in the water.

Blue whales feed mainly on small crustaceans and small fish, sometimes including squid.

The body of the blue whale is so huge that a tongue weighs 2,000 kilograms, a skull weighs 3,000 kilograms, a liver weighs 1,000 kilograms, and a heart weighs 500 kilograms.

The reason why the blue whale is so big is because it has an innate advantage: In the water.

Animals on land are affected by gravity and cannot grow wild and unbridled.

It is so heavy that the legs can no longer support the body.

But it's different in the sea.

The buoyancy of the water offsets part of the gravity, allowing the blue whale to easily grow into such a giant size.

The whale to easily grow into such a giant size.

Although whales live in water, they still use their lungs to breathe oxygen from the atmosphere.

The nostrils of whales are different from other mammals.

They have no nasal shell, and the nostrils open between the two eyes on the top of the head.

In some species of whales, the two nostrils are close together, and some whales are more special.

The nostrils merge into one nostril.

The lungs of whales are particularly large, such as those of blue whales.

They weigh 1,500 kilograms and can hold 1,500 liters of air.

With such a large lung capacity, whales don't have to float to the surface to breathe air.

But the diving time should not be too long.

Generally, after more than ten minutes, the whale still needs to come out of the water to get fresh air.

When ventilating, whales first expel a lot of air from their lungs.

When the powerful airflow rushes out of the whale's nostrils, the sea water is also sprayed into the air, and a sea "geyser" appears on the blue sea.

Why do whales jump out of the water?

In nature, there are various ways of courtship among different species.

For example, peacocks can attract the opposite sex by opening their screens.

Cicadas can also attract the opposite sex by singing.

Some insects can also attract the opposite sex by releasing chemical signals.

The way whales attract the opposite sex is also quite special.

They can jump out of the water and then fall back into the sea heavily.

This is actually a way for whales to express their courtship information to the opposite sex by showing their strength.