Although whales are mammals, they spend their entire lives in the sea and are fully adapted to life in the sea. Whether near the Antarctic or Arctic oceans, equatorial or offshore waters.

All can be their active territory, and all have their traces. Look at the azure sea, see the giant whales, and the bad mood will improve.

Its physical characteristics.

Whales are 1 to 30 meters long, similar to fish, with bare skin, only a few hairs on the snout, and no sweat and sebaceous glands.

The forelimbs were flipper-like, and the hindlimbs were completely degenerated, leaving only a pair of small bone fragments in the body.

The skin at the end of the tail expands from side to side to form a horizontal caudal fin. There is no pinna because there is a thick layer of fat under the skin that keeps you warm, loses weight, and is good for swimming. Some species have a dorsal fin.

Small eyes, no nictitating membrane, no lacrimal glands, poor vision. There are 1 or 2 external nostrils, located on the top of the head, commonly known as fumaroles. Although there is no pinna, but sensitive hearing.

Breastfeed in water. There is a lobe on each side of the lung. The stomach is divided into 4 compartments.

Habits of whales.

Food.

Whales in the Southern Ocean mainly feed on krill, but also some crustacean zooplankton such as copepods. Sperm whales, toothed whales, eat mainly squid and fish.

Whales do not drink seawater, but extract water from their food by metabolizing fats.

Breathe.

"Fountain" breathing is a unique living habit of whales.

How do whales breathe when they sleep?

When they sleep, they rely on the whale's left and right brain to take turns resting to move. When the left brain is at rest, the right brain is responsible for regulating surface breathing. Likewise, while the right brain is at rest, it is the left brain's turn to regulate surface breathing.

Breed.

Breeds outside Antarctica, usually once a year, with one litter per litter. The gestation period is generally 9 to 12 months, 12 months for blue whales, and 16 months for sperm whales.

Body temperature.

The common feature of cetaceans is a constant body temperature, about 35.4 ℃. Bare skin, no body hair, only a few setae on the muzzle, no sweat or sebaceous glands.

Place of residence.

While their specific ranges vary by species, whales live in oceans around the world. Because whales have a lot of body fat, they float easily in the water.

Speed.

Sperm whales swim at a slower speed, generally 10 kilometers per hour, and the fastest is 25 kilometers. The diving time and depth of the whales are also amazing, they can dive into the deep sea of ​​200 to 300 meters for 2 hours.

Whales are suitable for living in the sea, allowing them to fly freely in their own world.