As far as the entire marine mammals are concerned, whales have the largest number of species and the largest number. Whales can be divided into two categories: one is those that have no teeth in their mouths and only have baleen, which are called baleen whales; the other are those that have no baleen in their mouths and still retain teeth, which are called toothed whales. Although there are few types of baleen whales, their huge bodies have made them the main targets of human capture. Among them are blue whales with huge and incomparable bodies, slow-moving right whales with big heads and fat bodies, and short-bodied and long-armed whales that like to swim close to the coast. , humpback whales with funny movements, minke whales with small bodies and pointed beaks, and so on. There are many types of toothed whales. Except for sperm whales, the rest are generally smaller, such as the extremely ferocious killer whales and dolphins. Although the bodies of whales vary in length and thickness, they are all streamlined and look like fish, so people often call them whales. However, whales are beasts. Like humans, it constantly surfaces to breathe air. Sometimes we can see white mist columns ejected by whales when they exhale on the sea. Some are more than ten meters high and look like fountains, which is very spectacular.
Whales are mammals that live in the water throughout their lives and are so dependent on water that they cannot live without the water. In order to adapt to life in the water and reduce resistance, their hind limbs disappear and their forelimbs become paddle boards for paddling. The body becomes streamlined and resembles a fish. Therefore, their diving ability is very strong. Dolphins (small toothed whales) can dive to a depth of 100-300 meters and stay for 4-5 minutes. Fin whales can stay 300-500 meters underwater for an hour. Whale--Sperm whale can dive to less than 1,000 meters and stay in the water for up to 2 hours. In 1955, a sperm whale was found entangled in a submarine cable in the sea near Ecuador. Its diving depth reached 1,133 meters. A sperm whale was found entangled in a cable and suffocated at a depth of 2,200 meters in the waters near Lisbon, the capital of Portugal. This is the deepest diving record for a mammal so far.
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