Whale, Defenition, Types, and Facts

whale | Defenition, Types, and Facts
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whale, any of the larger species of aquatic mammals belonging to the order Cetacea. The term whale can be used in reference to any cetacean, including porpoises and dolphins, but in general it is applied to those more than 3 meters (10 feet) long.
An exception is the 2.7-metre dwarf sperm whale, so called for its otherwise striking resemblance to its larger namesake. Whales are the heaviest known animals, living or fossil, reaching a maximum size in the blue whale of perhaps more than 30 meters and 200 metric tons. Despite living in a medium that has much greater thermal conduction characteristics than air, whales, like other mammals, must regulate their body temperature.
Hair, however, is restricted to the head, appearing mainly as isolated whiskers near the mouth and blowhole.
Blubber serves as an insulating layer to protect small whales from hypothermia.
Large whales have the opposite problem in that they can produce too much heat; they possess elaborate thermoregulation mechanisms to prevent overheating.
Because of the restricted utility of vision underwater, whales use sound to perceive and interpret their environment and to communicate, sometimes over vast distances.
Biologists have computed that the 10-hertz sounds of fin whales, for example, can travel over 1,800 km (1,100 miles). Toothed whales can produce sounds and interpret their reflections via active echolocation. The extent to which baleen whales have this ability is unknown.
Following internal fertilization, female whales are pregnant for about a year. The young are relatively large when born-one-third to one-half the length of the mother. They are nursed for about six months on extremely rich milk containing almost 50 percent fat. Whales have one pair of nipples located at the rear of the abdomen near the genital opening.
Whales are distributed throughout the world’s oceans and seas, from the Equator to the polar ice, except for the landlocked Caspian and Aral seas.
They are mammals, and they share the defining traits of that group: they breathe air, are warm-blooded, give live birth, suckle their young on milk, and have hair.
All are entirely aquatic, with specialized adaptations such as flippers and tail flukes for living in water. Whales must surface regularly to breathe, evacuating their lungs more completely than most mammals in an almost explosive breath known as a blow. Blows are visible because water vapour in the whale’s hot breath condenses when the blow is released.
The first fossil whales are known from rocks approximately 50 million years old. These members of the extinct suborder Archaeoceti are the primitive whales from which modern whales are derived. They show many similarities to terrestrial mammals, including a differentiated dentition (heterodonty) consisting of incisors, canines, premolars, and molars. Archaeocetes gave rise to the living
Humans have long utilized stranded whales as a food resource, and historically whales were hunted for whale oil and baleen. In the early 20th century, as demand increased and technology enabled meat to be frozen at sea, whales began to be taken in larger numbers for human consumption and for specialty products. Scientific concern over the increased catch of whales in the Southern Hemisphere in the 1930s led to the ratification of the International Whaling Convention and the founding of the International Whaling Commission in 1946.
Through the years this agency has acted to moderate whaling, and it instituted a moratorium on commercial whaling in the late 1980s. Some whaling still occurs under special permits. Native peoples are also allowed to continue traditional whale hunting that has been a part of their culture.
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source: www.britannica...
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Whale, Defenition, Types, and Facts