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- Cetacea abstract "Cetacea is a widely distributed and diverse infraorder of fully aquatic marine mammals. There are 88 extant species of cetaceans. The two suborders of cetaceans, Mysticeti and Odontoceti, are thought to have split up around 34 million years ago. Whales and dolphins, the paraphyletic groups of Cetacea, as well as porpoises, belong to the clade Cetartiodactyla with even-toed ungulates; their closest living relatives are the hippopotamuses which diverged about 40 million years ago.Cetaceans range in size from the 4.5 feet (1.4 m) and 120 pounds (54 kg) vaquita to the 110 feet (34 m) and 210 short tons (190 t) blue whale, which is also the largest creature on earth. Several species of mysticetes exhibit sexual dimorphism, in that the females are larger than males. They have streamlined bodies and two limbs that are modified into flippers. Some cetaceans can travel at up to 20 knots. Balaenopterids use throat pleats to expand their mouths in order to take in gulps of water. Balaenids have heads that can make up 40% of their body mass. Odontocetes have conical teeth designed for catching fish or squid. Mysticetes have a well developed sense of "smell", whereas odontocetes have well-developed hearing − so well adapted for both air and water that some can survive even if they are blind. Some species are well adapted for diving to great depths. They have a layer of fat, or blubber, under the skin to keep warm in the cold water.Cetaceans are widespread, but some, as with the mysticetes, specialize in certain environments. Most mysticetes prefer the colder waters of the Northern and Southern Hemispheres, and migrate to the equator to give birth. Odontocetes feed largely on fish and squid, but a few, like the killer whale, feed on mammals, such as pinnipeds. Grey whales are specialized for feeding on bottom-dwelling mollusks. Males typically mate with multiple females every year, but females only mate every two to three years. Calves are typically born in the spring and summer months and females bear all the responsibility for raising them. Mothers of some species fast and nurse their young for a relatively long period of time. Some whales produce a variety of vocalizations, notably the songs of the humpback whale. Many species, mainly dolphins, are highly sociable, with some pods reaching over a thousand individuals.Once relentlessly hunted for their products, whales are now protected by international law. Some species are attributed with high levels of intelligence. At the 2012 meeting of the American Association for the Advancement of Science, support was reiterated for a cetacean bill of rights, listing cetaceans as non-human persons. The North Atlantic right whales nearly became extinct in the twentieth century, with a population low of 450, and is considered functionally extinct by cetologists, and the Baiji is also considered functionally extinct by the IUCN with the last sighting in 2004. Besides whaling, they also face threats from bycatch and marine pollution. The meat, blubber and baleen of whales have traditionally been used by indigenous peoples of the Arctic. Whales occasionally feature in literature and film, as in the great white whale of Herman Melville's Moby Dick. Small cetaceans, mainly dolphins, are kept in captivity and trained to perform tricks, but breeding success has been poor. Whale watching has become a form of tourism around the world.".
- Cetacea thumbnail The_Cetacea.jpg?width=300.
- Cetacea wikiPageExternalLink Cetaceans?topic=49540.
- Cetacea wikiPageExternalLink dolphins_and_whales.
- Cetacea wikiPageExternalLink futuyma_cetacea.html.
- Cetacea wikiPageExternalLink www.crru.org.uk.
- Cetacea wikiPageExternalLink taxonomy.asp.
- Cetacea wikiPageExternalLink species_in_peril.
- Cetacea wikiPageExternalLink cetaceans.
- Cetacea wikiPageID "7626".
- Cetacea wikiPageLength "117186".
- Cetacea wikiPageOutDegree "527".
- Cetacea wikiPageRevisionID "683545421".
- Cetacea wikiPageWikiLink 38_Special_(band).
- Cetacea wikiPageWikiLink 52-hertz_whale.
- Cetacea wikiPageWikiLink Acuario_de_Valencia.
- Cetacea wikiPageWikiLink Allometric.
- Cetacea wikiPageWikiLink Allometry.
- Cetacea wikiPageWikiLink Amazon_River_Dolphin.
- 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 Andrews_beaked_whale.
- Cetacea wikiPageWikiLink Andrewsiphius.
- Cetacea wikiPageWikiLink Animal_cognition.
- Cetacea wikiPageWikiLink Animal_echolocation.
- Cetacea wikiPageWikiLink Animal_intelligence.
- Cetacea wikiPageWikiLink Anklebone.
- Cetacea wikiPageWikiLink Antarctic_minke_whale.
- Cetacea wikiPageWikiLink Arabian_common_dolphin.
- Cetacea wikiPageWikiLink Araguaian_river_dolphin.
- Cetacea wikiPageWikiLink Archaeocetes.
- Cetacea wikiPageWikiLink Archaeoceti.
- Cetacea wikiPageWikiLink Argentina.
- Cetacea wikiPageWikiLink Arnouxs_beaked_whale.
- Cetacea wikiPageWikiLink Artiodactyla.
- Cetacea wikiPageWikiLink Artiodactyls.
- Cetacea wikiPageWikiLink Atlantic_Spotted_Dolphin.
- Cetacea wikiPageWikiLink Atlantic_humpback_dolphin.
- Cetacea wikiPageWikiLink Atlantic_spotted_dolphin.
- Cetacea wikiPageWikiLink Atlantic_white-sided_dolphin.
- Cetacea wikiPageWikiLink Auditory_bulla.
- Cetacea wikiPageWikiLink Auricle_(anatomy).
- Cetacea wikiPageWikiLink Australian_snubfin_dolphin.
- Cetacea wikiPageWikiLink Baiji.
- Cetacea wikiPageWikiLink Bairds_beaked_whale.
- Cetacea wikiPageWikiLink Balaena.
- Cetacea wikiPageWikiLink Balaenidae.
- Cetacea wikiPageWikiLink Balaenoptera.
- Cetacea wikiPageWikiLink Balaenopteridae.
- Cetacea wikiPageWikiLink Balaenopterinae.
- Cetacea wikiPageWikiLink Baleen.
- Cetacea wikiPageWikiLink Baleen_whale.
- Cetacea wikiPageWikiLink Baleen_whales.
- Cetacea wikiPageWikiLink Barenaked_Ladies.
- Cetacea wikiPageWikiLink Barnums_American_Museum.
- Cetacea wikiPageWikiLink Basilosaurus.
- Cetacea wikiPageWikiLink Beaked_whale.
- Cetacea wikiPageWikiLink Beaked_whales.
- Cetacea wikiPageWikiLink Beluga_(whale).
- Cetacea wikiPageWikiLink Beluga_whale.
- Cetacea wikiPageWikiLink Berardius.
- Cetacea wikiPageWikiLink Biosonar.
- 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_dolphin.
- Cetacea wikiPageWikiLink Bottlenose_whale.
- Cetacea wikiPageWikiLink Bowhead_whale.
- Cetacea wikiPageWikiLink Bowhead_whales.
- Cetacea wikiPageWikiLink Brain-to-body_mass_ratio.
- Cetacea wikiPageWikiLink Brain_size.
- Cetacea wikiPageWikiLink Brain_to_body_mass_ratio.
- Cetacea wikiPageWikiLink Brendan.
- Cetacea wikiPageWikiLink Brydes_whale.
- Cetacea wikiPageWikiLink Bubble_net.
- Cetacea wikiPageWikiLink Bubble_ring.
- Cetacea wikiPageWikiLink Burmeisters_porpoise.
- Cetacea wikiPageWikiLink Burrunan_dolphin.
- Cetacea wikiPageWikiLink Caperea.
- Cetacea wikiPageWikiLink Carbonic_acid.
- Cetacea wikiPageWikiLink Category:Cetaceans.
- Cetacea wikiPageWikiLink Category:Mammal_orders.
- Cetacea wikiPageWikiLink Category:Ypresian_first_appearances.
- Cetacea wikiPageWikiLink Caudal_vertebrae.
- Cetacea wikiPageWikiLink Centromere.
- Cetacea wikiPageWikiLink Centromeres.
- Cetacea wikiPageWikiLink Cephalorhynchus.
- Cetacea wikiPageWikiLink Cervical_spine.
- Cetacea wikiPageWikiLink Cervical_vertebrae.
- Cetacea wikiPageWikiLink Cetacea.
- Cetacea wikiPageWikiLink Cetacean_intelligence.
- Cetacea wikiPageWikiLink Cetacean_stranding.