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Topic: Blowhole (biology)

	Blowhole (biology) - Wikipedia, the free encyclopedia
		In biology, a blowhole is the hole at the top of a Cetacean's head through which the animal breathes air.
		The evolution of the blowhole isn't entirely clear, but it is known that the early whales still had nostrils on the front of their head and that they moved to a position further back on their head over time, but still in front of their brain which has moved backwards as well.
		The sperm whale is a toothed whale and also has a single blowhole, but unlike other toothed whales it has a double air duct leading up to it and the blowhole is located left of center.
	en.wikipedia.org /wiki/Blowhole_(biology) (349 words)

	Blowhole - Wikipedia, the free encyclopedia
		Blowhole (biology), the hole at the top of a whale or other cetacean's head, homologous with a nostril
		Blowhole (geology), a hole at the inland end of a sea cave through which waves funnel up and out
		This is a disambiguation page: a list of articles associated with the same title.
	en.wikipedia.org /wiki/Blowhole (114 words)

	WHALES and DOLPHINS of SOUTH AFRICA- Whale and dolphin identification,biology and behaviour.
		Biology: Females reach sexual maturity at about 12 meters and like all baleen whales they tend to be larger than the males of equivalent age.
		Biology: Orcas breed the year round and calves are born after a 13-16 month period of gestation.
		Biology: Calves are born throughout the year, although births reach a peak during the spring and summer months.
	www.oceansafrica.com /whales.htm (3407 words)

	Glacier Bay Alaska - Whale Watching Tours with Fairweather Adventures
		Blowholes are located on the top or back of a whale's head, depending on species.
		Humpback whales' blowholes are located near the top of their heads.
		Blowholes are covered by musular flaps that keep water from entering (the blowhole) when the whale is submerged.
	www.fishglacierbay.com /AboutWhales1-1.htm (2120 words)

	Biology
		They breathe air through an opening at the top of their head called a blowhole.
		These sounds are produced by moving air in the nasal passages near their blowhole.
		The thick muscular flap covering their blowhole can be altered to produce sounds.
	www.cmaquarium.org /biology.htm (727 words)

	WhaleNet/Scientific American: Ask the Experts: Biology
		To avoid drowning during sleep, it is crucial that marine mammals retain control of their blowhole.
		The blowhole is a flap of skin that is thought to open and close under the voluntary control of the animal.
		Although still a matter of discussion, most researchers feel that in order to breathe, a dolphin or whale must be conscious and alert to recognize that its blowhole is at the surface.
	whale.wheelock.edu /whalenet-stuff/sleeppage (913 words)

	[No title]
		Tupical of sick animals wjo rest in water with blowhole exposed - results in drying of skin Prevention/treatment apply moisture retaining ointments to affected areas 4.
		External Parasites Ciliated protozoans in blowhole exudate Copepods/Barnacles (Cirripedia) attach to edge of flukes 7.
		Biology and Medicine, Charles C. Thomas, Springfield, Illinois, 1972.
	netvet.wustl.edu /species/marine/marnmaml.txt (5445 words)

	Tasmania PWS - Wildlife - Whales
		A remarkable example is the 'bubble-netting' behaviour of the humpback whale, in which the animal expels a stream of bubbles from the blowhole while slowly ascending in a spiral to the surface.
		Many aspects of cetacean biology reflect their adaptation to the marine environment.
		The blow of a whale is the result of expired air (not water) and an oily residue secreted from the lining of the windpipe being forced out through the blowhole.
	www.parks.tas.gov.au /wildlife/mammals/whales.html (1029 words)

	DOLPHINS, MARINE MAMMALS, OCEAN CONSERVATION AND THE NATURAL ENVIRONMENT - SOLAR NAVIGATOR WORLD ELECTRIC NAVIGATION ...
		Complex nerve endings around the blowhole sense pressure changes so the dolphin knows exactly when the blowhole is in or nearing the air and can be opened.
		Water in a dolphin's blowhole will actually drown it so powerful muscles close the blowhole as it dives under the water again.
		Dolphins main predators are sharks and unfortunately man, through direct killing for food,netting, pollution, and fishing.
	www.solarnavigator.net /dolphins.htm (1735 words)

	Biology - Scuba Diving Adventures
		They breathe air through blowhole(s) into lungs (unlike fish who breathe using gills).
		They have one blowhole (nostril) and use echolocation to hunt.
		Baleen whales are larger than the toothed whales and have 2 blowholes (nostrils).
	www.highclass-adventure.com /biology_e/biology_whale.php (943 words)

	The Origin of Whales and the Power of Independent Evidence
		However, evolutionary biology predicts more than just the existence of fossil ancestors with certain characteristics - it also predicts that all other biological disciplines should also reveals patterns of similarity among whales, their ancestors, and other mammals correlated with evolutionary relatedness between groups.
		The rearward migration of these bones is the process by which the nasal openings have moved to the top of the skull, creating blowholes and shifting the brain and the auditory apparatus to the back of the skull.
		That is, whales should be more similar in their molecular biology to groups of animals with which they share a more recent common ancestor than to other animals that exhibit convergent similarities in morphology, ecology, or behavior.
	www.talkorigins.org /features/whales (6397 words)

	Dall's porpoise
		There is a slight indentation in the head near the blowhole.
		in: A. Bjørge and G.P. Donovan (eds.): Biology of the Phocoenids, pp.
		Turnock, B.J. and Buckland, S.T. Trends in abundance of Dall's porpoise in the Western North Pacific, 1979-1989 in: A. Bjørge and G.P. Donovan (eds.): Biology of the Phocoenids, pp.
	ourworld.compuserve.com /homepages/jaap/dalls.htm (871 words)

	Oceanlink \| marine sciences education and fun
		The blowholes and nasal passages are not at all connected with their esophagus and stomach.
		A: All cetaceans (whales, dolphins and porpoises) breathe only through their blowholes, which are situated on or near the top of the head.
		Blowholes are similar to nostrils in other mammals, serving as openings to the respiratory passages.
	www.oceanlink.island.net /ask/answersmamm.html (7405 words)

	Blowhole - Whale Glossary
		Blowholes are located on the top or back of the head.
		This exhaled air from the blowhole is called the blow and usually forms a gusher or a bushy stream of misty air and vapor.
		(Blowholes are in a closed position when the whale relaxes.) This breathing pattern takes only a fraction of a second for small cetaceans (like dolphins and porpoises) but may take a few seconds for larger whales (like the large balleen whales).
	www.zoomschool.com /subjects/whales/glossary/Blowhole.shtml (265 words)

	Order Cetacea - Cetacean Anatomy
		The general and overall body shape of most cetaceans is a streamlined and sleek form, with few distruptions which are hindering to passage through the water.
		The unique anatomy of a cetacean typically consists of the flukes, peduncle, pectoral flippers, dorsal fin, rostrum, blowhole, melon, and genital region.
		The blowhole of a dolphin is formed by a muscular flap which is opened or closed voluntarily by the cetacean and provides a water tight seal.
	cetacea147.tripod.com /anatomy.html (1095 words)

	Mammals - Resources - Cetacean FAQs
		However, it is the cetaceans that are the most specialised in the aquatic environment and for a long time even the most basic aspects of their biology remained a mystery.
		Strandings represent an important opportunity to learn more about the biology of cetaceans and it is important to contact authorities if you find one, even if it is a common species.
		In the toothed whales and dolphins these sounds are produced in the soft tissues of the nasal passages near to the blowhole and transmitted by a large fatty structure (the melon) on the forehead.
	www.amonline.net.au /mammals/resources/cetacean_faq.htm (1954 words)

	Dolphin Encounters ℠ \| Marine Mammal Strandings
		Data is taken from animals that are dead or alive, and this data has served as an invaluable tool in learning about the biology, illness, and mortality of different species; not only the well-known (such as Tursiops) but also the little known and even never before seen.
		The eyes and blowhole must be protected from blowing sand and kept moist with clean water.
		Pouring water around the blowhole area should only be done when the blowhole is closed, usually best just after a breath.
	www.dolphinencounters.com /strandings.htm (1372 words)

	Myotis sodalis Miller and Allen; Indiana Bat
		In 1972, approximately 20,000 bats were observed; in 1975, 6,050 were present; in 1987, 10,760 bats were counted; in 1991, 5,383 bats were counted; and in 1993, 3,900 bats were present in the same cave.
		Harvey (1992) noted that approximately 8,500 bats hibernate in Blowhole Cave and a small colony of approximately 200 Indiana bats hibernate in Bull Cave.
		Blount Co. : Blowhole Cave; Bull Cave; Scott Gap Cave (Wallace, 1984).
	www.discoverlife.org /nh/tx/Vertebrata/Mammalia/Vespertilionidae/Myotis/sodalis (920 words)

	HOW TO LIVEN UP YOUR CLASSROOM WITH A POD OF WHALES
		The subjects we cover are biology, myth, evolution, whaling and conservation.
		That's where your blowhole would be if you were a whale.
		At the count of three you will hold your breath, close your blowhole and when 10 seconds are up (I'll count them) you are all to let out your air, inhale quickly and close your blowhole.
	www.awionline.org /pubs/htlycw.html (838 words)

	Golden Gater Online (Site not responding. Last check: 2007-11-02)
		She is the director of the SF State Romberg Tiburon Center for Environmental Studies.
		For a moment, the students saw water burst out of a blowhole, and the humpback resembled a large sinking island as it disappeared from sight.
		Chris Mah, SF State biology graduate student, was onboard to collect specimens for the museum at the California Academy of Science.
	www.journalism.sfsu.edu /www/pubs/gater/spring96/may16/14.html (459 words)

	HUMPBACK WHALES
		The blowholes of baleen whales have two openings, while those of toothed whales have only a single opening.
		It was this cloud of condensation which enabled whalers to spot whales and led to the famous "Thar she blows!" decree.
		The double blowhole of the baleen whale creates a characteristic v-shaped spout, and that of the toothed whale a single spout pointed diagonally forward.
	earthtrust.org /wlcurric/whales.html (4658 words)

	Naples Free-Net - What's New
		The hospital attempts to rehabilitate these animals and return them to the wild while their staff seeks to learn information that will expand their knowledge of the basic biology, the veterinary care and the disease processes of these mammals.
		A cetacean is defined as "being the order of placental mammals having no hind limbs and a blowhole for breathing." The word is pronounced see-tay-shun and comes from the Latin "cetus" and the ancient Greek "ketos" which mean a sea monster.
		Do not pull the animal by its fins or tail and be very careful not to get water down the blowhole when dousing.
	home.naples.net /default.cfm?fuseaction=news.news&newsid=456 (910 words)

	Giants: Sperm Whale (Site not responding. Last check: 2007-11-02)
		With its huge, rectangular head and strange, wrinkly skin, the Sperm Whale is easily recognizable, yet it remains one of the least known of all large animals.
		It is the largest of the toothed whales and, like them, has a single blowhole, but recent research using molecular genetics has revealed that the Sperm Whale is actually more closely related to baleen whales than it is to other toothed cetaceans.
		The Sperm Whale's head contains a huge reservoir of clear oil that may be used to focus and resonate sounds that can be used for communication or to stun prey.
	www.elasmo-research.org /education/evolution/g_sperm_whale.htm (332 words)

	The Porpoise Page - Information on Porpoises
		There is a slight indentation at the blowhole.
		Because this species has rarely been studied, very little is known about it's reproductive biology.
		However, it is speculated that its calving season occurs in the autumn.
	www.theporpoisepage.com /burmeisters.php (426 words)

	Nature Works - Dolphins, Whales and Porpoises (Site not responding. Last check: 2007-11-02)
		When a whale comes up for air, it opens its blowhole and blows out old moist air in a spout of air and water.
		The oxygen they need to stay underwater for long periods of time is stored in their blood and muscle.
		They don't have vocal chords, they make clicks and whistle sounds by squeezing air back and forth between air sacs that are just under their blowholes.
	nhptv.org /natureworks/nwep6i.htm (744 words)

	WHALES, AQUATIC MAMMALS, MARINE CONSERVATION AND THE NATURAL ENVIRONMENT \| SOLAR NAVIGATOR AND THE MISSING WHALE
		Whales have one or two nostril openings, called blowholes, located far back on the top of the head; the nostril valves close and the lungs compress when the whale dives.
		They have a single blowhole and a wide throat to accommodate large prey.
		Male humpbacks produce a repeated pattern of sounds called a song during the mating season; the purpose is not clear, as all males in a group sing basically the same song.
	www.solarnavigator.net /whales.htm (1374 words)

	Miami Seaquarium - South Florida's #1 Tourist Attraction - Want to be a Trainer?
		A high school diploma is the minimum educational requirement, but a college degree in either psychology or a biology related science field (zoology or marine biology, for example), and experience in the performing arts are preferred.
		These husbandry behaviors allow the Vets to take blood, urine, feces, and blowhole samples on command with the least possible discomfort for the animals.
		The Animal Care department at Miami Seaquarium cares for all the animals in the park with the exclusion of dolphins, sea lions and the killer whale.
	www.miamiseaquarium.com /content/blogcategory/24/88 (422 words)

	NEFSC CRD 01-16
		While it may be possible to diagnose ovulation from samples of feces or blowhole exudates, this requires knowledge of relative hormone levels at various stages in the reproductive cycle and longitudinal sampling of individual females.
		The assays could be validated in bowhead whales through the collection of feces, blowhole exudate, serum and urine from individual dead whales whose reproductive tracts could be examined directly.
		Investigate use of blowhole exudates to assay for gonadal steroid hormones using samples from bowhead whales (similar to saliva assay).
	www.nefsc.noaa.gov /nefsc/publications/crd/crd0116/0116.htm (14217 words)

	Gulf of Maine Aquarium: Marine Mammal Frequently Asked Questions
		A strong background in zoology or marine biology is a plus, but many organizations are looking for individuals with diverse backgrounds.
		Many marine mammalogists believe that one of the unique sounds that dolphins make is a personalized call termed a "signature whistle." It is a high pitched series of squeaks, that when further analyzed, does not sound like any other dolphin.
		This may be their auditory "fingerprint." A stream of tiny bubbles is released from their blowhole during the whistle.
	octopus.gma.org /marinemammals/faqs.html (641 words)

	Balaenoptera physalus, Fin Whale at MarineBio.org
		A single ridge extends from the blowhole to the tip of the rostrum (upper jaw).
		There is a series of 56-100 pleats or grooves on the underside of its body extending from under the lower jaw to the navel.
		Two lighter "colored" chevrons begin midline behind the blowholes and slant down the sides towards the fluke (tail) on a diagonal upward to the dorsal fin, sometimes recurving forward on the back.
	www.marinebio.com /species.asp?id=40 (1529 words)

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