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Whales were originally thought to be animals that walked on all fours on land, but later "went to the sea" due to foraging problems, and practiced monogamy, like "bigfin whales" usually live alone, while other whales also live in groups. Their gestation period is generally about 12 months, one litter and one son, and the lactation period of young whales is 10 months, and the lifespan is about 60 to 70 years.
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The average lifespan in nature is 50 to 100 years, and it can survive for decades. Whales were once thought to be archaeozoents, with a lifespan of 500,1000 years, but in fact the average lifespan is only 30 years, and the longest is no more than 100 years. Beluga whales live an average of thirty to forty years, blue whales at least eighty years, killer whales average twenty to thirty-five years, and baleen whales live an average of forty to fifty years.
The average lifespan in the natural environment is 50 to 100 years, and it can survive for several decades. Whales were once thought to be archaeozoic and thought to live up to 500 1000 years, but in fact the average lifespan is only 30 years, and the longest lifespan is no more than 100 years. Beluga whales generally live for 30 to 40 years, blue whales for at least 80 years, killer whales for 20 to 35 years, and baleen whales for 40 to 50 years.
Although the cetacean is large, it is active all day long, and even sleep is not still, and in terms of body size ratio, it has a relatively high rate of metabolism compared to other large animals, so its lifespan is relatively not long.
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1. The general life expectancy in the natural environment is 50 to 100 years.
2. Cetaceans are completely aquatic mammals, and some mainly rely on echolocation to find food and avoid enemies. They generally feed on mollusks, fish, and zooplankton, and some species can also prey on seals, fur seals, etc. Every once in a while, it is necessary to ventilate.
3. From an anatomical point of view, many of the characteristics of cetaceans show a high degree of adaptation to life in the ocean. However, anatomical evidence is not sufficient to answer many questions about the origin of cetaceans.
4. However, from the perspective of biochemistry and genetics, cetaceans are closely related to ungulates, and the fossil record (about 50 million years ago) also supports the evolution of cetaceans from ungulates.
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1. The general life expectancy in the natural environment is 50 to 100 years.
2. Whales are divided into two categories, one is baleen whales, and the other is toothed whales. Whales belong to the phylum Vertebrates, subphylum Vertebrates, Mammalia, and Euzoa, which contain about 98 species of viviparous mammals that live in oceans and rivers. There are more than 30 species in China's waters.
All species of whales inhabit the ocean, with the exception of a few that live in freshwater.
3. The definition of whale itself is relatively vague, and whales can include all cetaceans, as well as cetaceans of specific families. All dolphins are also included in the whales. There are two main species of whales:
Baleen whales (mysticeti) and toothed whales (odontoceti). Baleen whales are small but huge, with the smallest known species being over 6 meters long, and the largest animal, the blue whale, is also a baleen whale. However, the size of toothed cetaceans varies greatly, with the smallest species only about 30 cm in length and the largest sperm whale more than 20 meters long.
Whales do not belong to the class of fish, but to the class of mammals.
The evolution route of whales is roughly as follows: from terrestrial bucky whales, through amphibious terrestrial whales, to basic aquatic but still developed limbs of proto-whales, to fully aquatic spear-toothed whales and dragon king whales with greatly degraded hind limbs, and finally from spear-toothed whales to modern toothed whales and baleen whales, which have experienced a total history of about 50 million years. >>>More
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