They recommend that the genus Balaenoptera be limited to the fin whale, have minke whales fall under the genus Pterobalaena, and have Rorqualus contain the Sei whale, Bryde's whale, Eden's whale, the blue whale, and Omura's whale. It is known that when the fluid inside the cochlea is disturbed by vibrations, it triggers sensory hairs which send electrical current to the brain, where vibrations are processed into sound. Like in humans, the food is mixed with hydrochloric acid and protein-digesting enzymes.  They are sexually dimorphic.  Blue whales stop producing foraging D calls once a mid-frequency sonar is activated, even though the sonar frequency range (1–8 kHz) far exceeds their sound production range (25–100 Hz). Gray Whales. Reaching 8,700 kilograms (19,200 lb) and 9.4 meters (31 ft), J.J. was the largest creature to be kept in captivity. The first compartment is known as the fore-stomach; this is where food gets ground up into an acidic liquid, which is then squirted into the main stomach. , Rorquals, needing to build speed to feed, have several adaptions for reducing drag, including a streamlined body; a small dorsal fin, relative to its size; and lack of external ears or long hair. These paired blowholes are longitudinal slits that converge anteriorly and widen posteriorly, which causes a V-shaped blow.  They are polygynous, in that a male may mate with more than one female. , Baleen whales have a relatively small brain compared to their body mass.  The initial evolution of baleen and filter feeding long preceded the evolution of gigantic body size, indicating the evolution of novel feeding mechanisms did not cause the evolution of gigantism. This allows baleen whales to detect chemicals and pheromones released by their prey. "Epibiotic macrofauna on common minke whales, "The Largest Penis in the World – Both for humans and animals, size does matter", "A Savage History: Whaling in the South Pacific and Southern Oceans", Whale Watching Worldwide: tourism numbers, expenditures and expanding economic benefits, "Gray Whale Removed From Endangered List", "IUCN Species of the Day: North Atlantic Right Whale", "Whaling in the Antarctic: Protecting Rights in Areas Beyond National Jurisdiction Through International Litigation", "U.N. Court Orders Japan to Halt Whaling Off Antarctica", "Japan to resume whaling in Antarctic despite court ruling", "Compliance with vessel speed restrictions to protect North Atlantic right whales", "Blue Whales Respond to Anthropogenic Noise", "J.J. While cetaceans were historically thought to have descended from mesonychids, (which would place them outside the order Artiodactyla), molecular evidence supports them as a clade of even-toed ungulates (Artiodactyla). Blue Whale (Balaenoptera musculus) Kim Westerskov/Photographer's Choice/Getty Images. The common minke whale has been divided into 3 subspecies: the North Atlantic minke whale (Balaenoptera acutorostrata acutorostrata), the North Pacific minke whale (Balaenoptera acutorostrata scammoni), and the dwarf minke whale (whose scientific name has not yet been determined).  Generally, a mother and calf pair, when faced with the threat of a killer whale pod, will either fight or flee. Typically, all humpback males in a population sing the same song over a breeding season, but the songs change slightly between seasons, and males in one population have been observed adapting the song from males of a neighboring population over a few breeding seasons. Pigmy right whales live in temperate waters of the Southern Hemisphere.  The mandible is connected to the skull by dense fibers and cartilage (fibrocartilage), allowing the jaw to swing open at almost a 90° angle. The degree of calcification varies between species, with the sei whale having 14.5% hydroxyapatite, a mineral that coats teeth and bones, whereas minke whales have 1–4% hydroxyapatite. Calves are born precocial, needing to be able to swim to the surface at the moment of their birth. , Most rorquals mate in warm waters in winter to give birth almost a year later. The creation of the Antarctic circumpolar current and its effects on global climate patterns is excluded as being causal for the same reason. Like toothed whales, they have a dense network of blood vessels (rete mirabile) which prevents heat-loss.  Some species leap out of the water, which may allow them to travel faster. Blue whales also make some of the loudest sounds in the animal kingdom. Males typically mate with more than one female (polygyny), although the degree of polygyny varies with the species. This minke whale is slightly larger than its more northern relatives and has gray pectoral fins, rather than the gray fins with white pectoral fin patches seen on the common minke whale. Gray whales are specialized for feeding on bottom-dwelling crustaceans. For species like the North Atlantic right whale, which migrates through some of the world's busiest shipping lanes, the biggest threat is from being struck by ships. , Unlike other whales (and most other mammals), the females are larger than the males. Description Baleen whales experienced their first radiation in the mid-Miocene.  Cetaceans (whales, dolphins, and porpoises) and artiodactyls are now classified under the order Cetartiodactyla, often still referred to as Artiodactyla (given that the cetaceans are deeply nested with the artiodactyls). Baleen whales have baleen plates in their upper jaws, rather than teeth. Rorquals also tend to be longer than the latter. These protections have allowed their numbers to recover. In 1864, it was moved into the genus Caperea after a skull of another specimen was discovered. However, light is bent more near the surface of the eye when in air as opposed to water; consequently, they can see much better in the air than in the water.  Some baleen whales will deliberately rub themselves on substrate to dislodge parasites. Baleen whales get the water they need from their food; however, the salt content of most of their prey (invertebrates) are similar to that of seawater, whereas the salt content of a whale's blood is considerably lower (three times lower) than that of seawater.  Peru, Uruguay, Australia, and New Zealand also support proposals to permanently forbid whaling south of the Equator, as Solor (an island of Indonesia) is the only place of the Southern Hemisphere that takes whales. , Baleen whales have rarely been kept in captivity. Researchers have been using passive acoustic recordings of whale calls to track their movements. The common minke whale or northern minke whale (Balaenoptera acutorostrata) is a species of minke whale within the suborder of baleen whales.. Right whales were so named by whalers who deemed them the "right" whales t… These animals rely on their baleen plates to sieve plankton and other small organisms from the water. Baleen whales can be found in all oceans worldwide, from polar seas to temperate and tropical zones. , Commercial whaling was historically important as an industry well throughout the 19th and 20th centuries. Baleen whales have two blowholes, which in right whales produce a distinctive V-shaped blow, the spout of water spray and vapour blown out when the whale surfaces to breathe. Humpbacks undertake long migrations each season between high latitude feeding grounds and low latitude breeding grounds, often fasting for weeks or months during the winter breeding season. Besides hunting, baleen whales also face threats from marine pollution and ocean acidification.  However, there is some discussion as to whether the gray whale should be classified into its own family, or as a rorqual.,, The taxonomic name "Mysticeti" (/ˌmɪstɪˈsiːtaɪ/) apparently derives from a translation error in early copies of Aristotle's Historia Animalium (in Ancient Greek), in which "ὁ μῦς τὸ κῆτος" (ho mus to kētos, "the mouse, the whale so called") was mistakenly translated as "ὁ μυστικῆτος" (ho mustikētos, "the Mysticetus"), which D. W. Rice (of the Society for Marine Mammalogy) in his 1998 work assumed was an ironic reference to the animals' great size.  To prevent stretching the mouth too far, rorquals have a sensory organ located in the middle of the jaw to regulate these functions. Blue whales are thought to be the largest animal ever to live on the Earth.  To prevent stretching the mouth too far, rorquals have a sensory organ located in the middle of the jaw to regulate these functions. Most species of baleen whale migrate long distances from high latitude waters during spring and summer months to more tropical waters during winter months. , The heart of baleen whales functions similarly to other mammals, with the major difference being the size. Adult male humpbacks produce the longest and most complex songs; sequences of moans, groans, roars, sighs, and chirps sometimes lasting more than ten minutes are repeated for hours. They have rarely been kept in captivity, and this has only been attempted with juveniles or members of one of the smallest species. Toothed Whale Species - … California blue whales are hypothesized to migrate between dense patches of prey, moving from central California in the summer and fall, to the Gulf of California in the winter, to the central Baja California Pacific coast in spring.. Calves are typically born in the winter and spring months and females bear all the responsibility for raising them. 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