Whale Any of the larger species of aquatic mammals belonging to the order Cetacea. This word whale is used in refer to any Cetacean, including porpoises and dolphins, however in general, it is used to refer to animals that are more than 3 meters (10 feet) long. The one exception to this rule is the 2.7-metre dwarf sperm whale ( Konia sinus) named for its otherwise striking resemblance to its larger namesake. Whales are the largest of known mammals, living or fossilized, reaching an absolute maximum for the blue whale (Balaenopterid muscle) which is perhaps greater thirty meters, and up to 200 meters (220 shorter [U.S. tons).
Whales are found all over the world’s oceans and oceans that extend from the Equator to the polar ice except for the landlocked Caspian and Aral seas. They are mammals and they have the most characteristic characteristics of this group They breathe air, are warm-blooded, birth live, feed their babies with milk, and also have hair. All are entirely aquatic, equipped with specializations like tail flukes and flippers that are designed for living in the water. Whales must surface regularly to breathe, evacuating their lungs in greater detail than other mammals. They also breathe the breath of almost explosive force known as a blow. Blowing is visible due to the fact that they contain water vapor. The hot breath expands when an attack is expelled.
Despite being in a place with much better thermal conduction characteristics than air, whales like other mammals, must regulate their body temperature. Hair, however, is limited to the headand appears as whiskers that are isolated (vibrissae) near the mouth and blowhole. Blubber serves as an insulating layer to shield small whales from suffering hypothermia. Large whales suffer from the opposite issue in that they could generate excessive heat. they possess elaborate thermoregulation mechanisms to stop them from overheating.
Due to the insufficient utility of their vision underwater Whales make use of audio to sense and interpret their environment and to communicate, often across vast distances. Biologists have discovered that sound waves of fin whales at 10 Hz ( Balaenopterid physiques) for instance, can travel more than 1 800 km (1,100 miles). Toothed whales produce sounds and interpret their reflections using active echolocation. The extent to which baleen whales are able to use this ability is unknown.
After fertilization by internal ovulation the female whales can become pregnant for about a year. The babies are quite big when they are born, between one third and one-half the length of their mother. They are nursed for about six months with extremely rich milk that contains more than 50 percent fat. Whales are equipped with one pair Nipples that are located in the rear of the abdomen close to the open genital region.
The first fossil whales were discovered from rock that is approximately fifty million years long (Early Eocene Epoch). These extinct members of the suborder Archaeoceti are the whales of the early stages from which modern whales originate. They share many features with terrestrial mammals, for example, dental structures that are distinct (heterodonty) composed of incisors, canines, premolars and molars. Archeocytes created the living suborders, namely the baleen whales (suborder Masticate) and the toothed whales (suborder Odontocete).
Masticates have baleen plates and consume small prey via the mouthful, mostly in the form of moving (planktonic) crustaceans such copepods and krill. However they may also consume small schooling fish or squid. One interesting departure from this pattern is the gray whale ( Eschrichtius robustus) which eats mainly shrimp and other bottom-dwelling animals: it scoops up mud and strains it through baleen plates and keeps its food. Odontocetes have simple teeth (homodonty) and they hunt for particular squids, fish, as well as other prey. The largest of odontocete’s, the Sperm whale ( Physeter catodon) often feeds on huge squid.