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- Cetacea abstract "Cetacea (/sᵻˈteɪʃə/), (from Latin cetus \"large sea creature\" and Greek ketos \"sea-monster\") are a widely distributed and diverse infraorder of carnivorous, aquatic, marine mammals. They comprise the families Balaenidae (right whales), Balaenoptera (rorqual), Eschrichtiidae (the gray whale), Delphinidae (oceanic dolphins), Monodontidae (Arctic whales), Phocoenidae (porpoises), Physeteridae (the sperm whale), Kogiidae (lesser sperm whales), Platanistidae (Old World river dolphins), Iniidae (New World river dolphins), Pontoporiidae (the La plata dolphin), and Ziphidae (beaked whales). There are currently 88 species of cetacean. While cetaceans were historically thought to have descended from mesonychids, molecular evidence supports them as descendants of Artiodactyla (even-toed ungulates). Cetaceans belong to the order Cetartiodactyla (derived from Cetacea and Artiodactyla), and their closest living relatives are hippopotamuses, having diverged about sixty million years ago.Cetaceans range in size from the 1.3 m (4.3 ft) and 50 kg (110 lb) Maui's dolphin (a subspecies of Hector's dolphin) to the 34 m (112 ft) and 190 t (210 short tons) blue whale, which is also the largest creature. Several species exhibit sexual dimorphism. They have streamlined bodies and two limbs that are modified into flippers. Though not as flexible and agile as seals, cetaceans can swim very fast. Baleen whales use their plates to filter out food from the water, while toothed whales use their teeth to catch fast prey. River dolphins, unlike most other cetaceans, have the ability to turn their head 90°. By comparison, other cetaceans have fused neck vertebrae, and are unable to turn their head at all. Baleen whales have two blowholes, while toothed whales have only one. Toothed whales have well-developed senses—their eyesight and hearing are adapted for both air and water, and they have advanced sonar capabilities using their melon. A lot of species are well adapted for diving to great depths. Most have a layer of fat, or blubber, under the skin to keep warm in the cold water.Although cetaceans are widespread, most species prefer the colder waters of the Northern and Southern Hemispheres. They spend their lives in the water, mating, giving birth, molting completely submerged, coming to the surface to breathe. Toothed whales feed largely on fish and marine invertebrates; but a few, like the killer whale, feed on large vertebrates, such as penguins and seals. Grey whales are specialized for feeding on bottom-dwelling mollusks. Males typically mate with more than one female (polygyny), although the degree of polygyny varies with the species. Male strategies for reproductive success vary between performing ritual displays or lek mating. Calves are typically born in the spring and summer months and females bear almost all the responsibility for raising them. Mothers of some species fast and nurse their young for a relatively long period. Cetaceans produce a number of vocalisations, notably the songs of the humpback whale, and the clicks of dolphins.The meat, blubber and oil of cetaceans have traditionally been used by indigenous peoples of the Arctic. Cetaceans have been depicted in various cultures worldwide. Dolphins are commonly kept in captivity and are even sometimes trained to perform tricks and tasks. Once relentlessly hunted by commercial industries for their products, cetaceans are now protected by international law. The Yangtze river dolphin has become functionally extinct (though sometimes ranked critically endangered) in the past century, while the North Atlantic right whale and Yangtze finless porpoise are ranked critically endangered by the International Union for Conservation of Nature. Besides hunting, cetaceans also face threats from accidental trapping and marine pollution.".
- Cetacea thumbnail The_Cetacea.jpg?width=300.
- Cetacea wikiPageExternalLink Cetaceans?topic=49540.
- Cetacea wikiPageExternalLink dolphins_and_whales.
- Cetacea wikiPageExternalLink futuyma_cetacea.html.
- Cetacea wikiPageExternalLink species_in_peril.
- Cetacea wikiPageExternalLink cetaceans.
- Cetacea wikiPageExternalLink www.crru.org.uk.
- Cetacea wikiPageExternalLink taxonomy.asp.
- Cetacea wikiPageID "7626".
- Cetacea wikiPageLength "124345".
- Cetacea wikiPageOutDegree "592".
- Cetacea wikiPageRevisionID "708275247".
- Cetacea wikiPageWikiLink 10th_edition_of_Systema_Naturae.
- Cetacea wikiPageWikiLink 38_Special_(band).
- Cetacea wikiPageWikiLink 52-hertz_whale.
- Cetacea wikiPageWikiLink Aboriginal_whaling.
- Cetacea wikiPageWikiLink Allometry.
- Cetacea wikiPageWikiLink Amazon_river_dolphin.
- Cetacea wikiPageWikiLink Ambergris.
- Cetacea wikiPageWikiLink Ambulocetidae.
- Cetacea wikiPageWikiLink Ambulocetus.
- Cetacea wikiPageWikiLink American_Association_for_the_Advancement_of_Science.
- Cetacea wikiPageWikiLink Ancient_Greek.
- Cetacea wikiPageWikiLink Andrews_beaked_whale.
- Cetacea wikiPageWikiLink Andrewsiphius.
- Cetacea wikiPageWikiLink Animal_cognition.
- Cetacea wikiPageWikiLink Animal_echolocation.
- Cetacea wikiPageWikiLink Antarctic_minke_whale.
- Cetacea wikiPageWikiLink Araguaian_river_dolphin.
- Cetacea wikiPageWikiLink Archaeoceti.
- Cetacea wikiPageWikiLink Argentina.
- Cetacea wikiPageWikiLink Aristotle.
- Cetacea wikiPageWikiLink Atlantic_spotted_dolphin.
- Cetacea wikiPageWikiLink Atlantic_white-sided_dolphin.
- Cetacea wikiPageWikiLink Auricle_(anatomy).
- Cetacea wikiPageWikiLink Australian_snubfin_dolphin.
- Cetacea wikiPageWikiLink Baiji.
- Cetacea wikiPageWikiLink Balaena.
- Cetacea wikiPageWikiLink Balaenidae.
- Cetacea wikiPageWikiLink Balaenoptera.
- Cetacea wikiPageWikiLink Baleen.
- Cetacea wikiPageWikiLink Baleen_whale.
- Cetacea wikiPageWikiLink Barenaked_Ladies.
- Cetacea wikiPageWikiLink Barnums_American_Museum.
- Cetacea wikiPageWikiLink Basilosaurus.
- Cetacea wikiPageWikiLink Beaked_whale.
- Cetacea wikiPageWikiLink Beluga_whale.
- Cetacea wikiPageWikiLink Blackfish_(film).
- Cetacea wikiPageWikiLink Blainvilles_beaked_whale.
- Cetacea wikiPageWikiLink Blowhole_(anatomy).
- Cetacea wikiPageWikiLink Blubber.
- Cetacea wikiPageWikiLink Blue_whale.
- Cetacea wikiPageWikiLink Bolivian_river_dolphin.
- Cetacea wikiPageWikiLink Bony_labyrinth.
- Cetacea wikiPageWikiLink Bottlenose_dolphin.
- Cetacea wikiPageWikiLink Bottlenose_whale.
- Cetacea wikiPageWikiLink Bowhead_whale.
- Cetacea wikiPageWikiLink Brain-to-body_mass_ratio.
- Cetacea wikiPageWikiLink Brain_size.
- Cetacea wikiPageWikiLink Brendan.
- Cetacea wikiPageWikiLink Brucellosis.
- Cetacea wikiPageWikiLink Brydes_whale.
- Cetacea wikiPageWikiLink Bubble_ring.
- Cetacea wikiPageWikiLink Burmeisters_porpoise.
- Cetacea wikiPageWikiLink Burrunan_dolphin.
- Cetacea wikiPageWikiLink Bycatch.
- Cetacea wikiPageWikiLink Cancellous_bone.
- Cetacea wikiPageWikiLink Carbonic_acid.
- Cetacea wikiPageWikiLink Cardiovascular_disease.
- Cetacea wikiPageWikiLink Carl_Linnaeus.
- Cetacea wikiPageWikiLink Carnivore.
- Cetacea wikiPageWikiLink Cartilage.
- Cetacea wikiPageWikiLink Category:Cetaceans.
- Cetacea wikiPageWikiLink Category:Extant_Ypresian_first_appearances.
- Cetacea wikiPageWikiLink Category:Mammal_orders.
- Cetacea wikiPageWikiLink Centromere.
- Cetacea wikiPageWikiLink Cephalorhynchus.
- Cetacea wikiPageWikiLink Cervical_vertebrae.
- Cetacea wikiPageWikiLink Cetacea.
- Cetacea wikiPageWikiLink Cetacean_stranding.
- Cetacea wikiPageWikiLink Cetology.
- Cetacea wikiPageWikiLink Cetotheriidae.
- Cetacea wikiPageWikiLink Cetus.
- Cetacea wikiPageWikiLink Cheap_Trick.
- Cetacea wikiPageWikiLink Chemotroph.
- Cetacea wikiPageWikiLink Chevron_(anatomy).
- Cetacea wikiPageWikiLink Chilean_dolphin.
- Cetacea wikiPageWikiLink Chronic_condition.
- Cetacea wikiPageWikiLink Churchill_River_(Hudson_Bay).
- Cetacea wikiPageWikiLink Circulatory_system.
- Cetacea wikiPageWikiLink Circumpolar_peoples.
- Cetacea wikiPageWikiLink Clavicle.
- Cetacea wikiPageWikiLink Clever_Hans.
- Cetacea wikiPageWikiLink Clymene_dolphin.
- Cetacea wikiPageWikiLink Code_of_Federal_Regulations.
- Cetacea wikiPageWikiLink Cold_seep.
- Cetacea wikiPageWikiLink Commersons_dolphin.
- Cetacea wikiPageWikiLink Common_bottlenose_dolphin.
- Cetacea wikiPageWikiLink Common_dolphin.