What are the habits of the baiji dolphin?

The white-tip dolphin, also known as "White Flag", belongs to the family Mammalia, Cetaceae, and Delphinidae. It has a body length of 2 to 3 meters and a weight of 100 to 300 kilograms. Its back is light blue-gray, and its bill is long and flat like a duck's bill, with teeth. There are about 130 teeth. The tooth roots are flat and wide, the head is round, the neck is short, and the cervical vertebrae are not healed. Due to living in water for a long time, the forelimbs have evolved into front fins, and the hind limbs have evolved into tail fins. The body is streamlined and is very suitable for swimming. The ears and eyes of the white-tip dolphins are highly degraded. When moving in the water, they can only rely on the echoes of ultrasonic waves to identify objects. They often float in the water in small groups, and when they encounter danger, they emit a deep buffalo-like roar. Baiji dolphins mainly feed on fish. An adult baiji dolphin eats 12 to 18 kilograms of fresh fish every day. Female dolphins eat more than usual during lactation. The baiji dolphin has four stomachs and an intestine that is 30 to 40 meters long, and has strong digestive power. The baiji dolphin's sleeping pattern is very special. Its two brain hemispheres alternate between wakefulness and sleep, working and resting regularly. The white-tip dolphin is one of only five freshwater dolphins in the world. Its ancestors lived on land 40 to 50 million years ago, and later moved to the water due to changes in the natural environment. In order to adapt to the aquatic environment, all parts of its body have undergone great changes, but it still maintains the characteristic of breathing with its lungs. It has to go to the water surface to breathe every one or two minutes. When breathing, it puts its head out of the water and inhales. After getting angry, he plunged into the water, causing a circle of waves. Especially before a storm, due to the low air pressure, they frequently come out of the water to breathe. Fishermen often predict weather changes based on this characteristic of the baiji dolphins.

The reproductive rate of white eels and dolphins is very low. They only give birth to one child every two years, and they rarely give birth to twins. Unlike other viviparous animals, piglets are born with their tails exposed first to avoid drowning. The newborn baby dolphin is about seven or eight inches long and weighs less than 1 kilogram. It bites the front fin of the mother dolphin with its beak without teeth. The mother dolphin takes it out of the water every few seconds to breathe. After two weeks, the dolphin begins to follow the mother dolphin. After more than a month, the dolphin can live independently. It takes about eight or nine years to mature.