Species and living habits of whales.

In the 1960s and 1970s, the blue whale was the largest and the killer whale was the fiercest whale.

General introduction of whales:

Whales are giant creatures in the ocean and mammals surrounded by dolphins. (But it is bigger than a dolphin, with a short mouth, flat forelimbs, degenerated hind limbs, shellfish fins, a wide and flat tail and water spray holes. It belongs to cetaceans (toothed whales, baleen whales and extinct archaea)-baleen whales and extinct archaea. Cetaceans, which can't be attributed generally, are classified into the family Dolphinidae.

It is widely distributed and can be seen in almost all waters around the world. It is maritime, and it adopts more group activities in behavior and seldom acts alone. Like dolphins, they like to have fun while foraging, such as jumping and beating waves, lifting whale tails, beating waves with whale tails, snorkeling and so on.

Whale species:

Whales inhabiting the Southern Ocean are divided into baleen whales and toothed whales, about 12 species. The larger baleen whales are blue whales, fin whales, blackboard whales, fin whales, giant arm whales and right whales. The larger toothed whales are sperm whales and killer whales.

Among them, the largest is the blue whale, and the largest number is the fin whale. Giant-armed whales and right whales are now almost captured and killed, and there are few survivors.

Whales are widely distributed in the southern ocean, and they appear almost south of the Antarctic convergence zone. Their distribution is closely related to that of krill. Blue whales are mainly distributed in ice floes, giant arm whales and black Hu whales live in the southernmost tip, arm whales can overwinter in Antarctic waters, and right whales are mainly distributed in sub-Antarctic areas; Toothed whales are distributed in the Antarctic convergence zone and migrate with the seasonal changes.

Living habits of whales:

Fin whales are used to living alone, and both males and females exist in the same sea area. Male fin whales can also use "singing" to attract female fin whales hundreds of kilometers away to mate with male fin whales in food-rich breeding grounds. Because the whale's "singing" frequency is similar to that of some military or commercial sonar, sonar is likely to interfere with the reproduction of fin whales, thus making it more difficult for this species with low reproduction rate.

The narwhal has a white abdomen and a black back with blue-gray or black-gray spots. It has a horn about 1 ~ 2 meters long on its head, which is actually a tooth. At present, most people think that the narwhal's tusks are only signs of secondary sexual characteristics, similar to the mane on the head of a male lion on land. (Habits to be investigated)

Whales were originally thought to be animals that walked on all fours on land. Later, because of the problem of foraging, monogamy was implemented in the sea. For example, "winged whales" usually live alone, while other whales live in groups. Their gestation period is generally around 12 months, with one child and one son. Calf suckles 10 month, and its life span is about 60~70 years old.

Whales swim back to certain waters in the cold zone and warm generation, and have a fixed swimming route. After living in cold areas in summer and supplementing nutrition, they begin to move to warm waters for breeding in autumn.

Whales eat shrimp, squid and fish, while killer whales eat penguins, seals, dolphins and whales, especially whale tongues. Wild killer whales are violent, but they can be tamed when they are raised from an early age, and they have high IQ and can be used for performances.

(Note: Killer whales eat a lot. It has been recorded that a killer whale ate 13 dolphins and 15 seals. )