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  • equigranular rock

    igneous rock: Fabric: Even-grained, or equigranular, rocks are characterized by essential minerals that all exhibit the same order of grain size, but this implied equality need not be taken too literally. For such rocks the combination terms panidiomorphic-granular, hypidiomorphic-granular, and allotriomorphic-granular are applied according to the occurrence of…

  • equilateral arch (construction)

    bridge: Stone arch bridges: ogival arch by concealing the angle at the crown and by starting the curves of the arches vertically in their springings from the piers. This elliptical shape of arch, in which the rise-to-span ratio was as low as 1:7, became known as basket-handled and has…

  • equilibrant (mechanics)

    mechanics: Statics: This force is called the equilibrant. An example is shown in Figure 18.

  • equilibrated structure (architecture)

    Antoni Gaudí: Life: …has come to be called equilibrated—that is, a structure designed to stand on its own without internal bracing, external buttressing, and the like—or, as Gaudí observed, as a tree stands. Among the primary elements of his system were piers and columns that tilt to transmit diagonal thrusts, and thin-shell, laminated…

  • equilibrium (thermodynamics)

    thermodynamics: Thermodynamic equilibrium: A particularly important concept is thermodynamic equilibrium, in which there is no tendency for the state of a system to change spontaneously. For example, the gas in a cylinder with a movable piston will be at equilibrium if the temperature and pressure inside are uniform…

  • equilibrium (biology)

    Proprioception, the perception by an animal of stimuli relating to its own position, posture, equilibrium, or internal condition. The coordination of movements requires continuous awareness of the position of each limb. The receptors in the skeletal (striated) muscles and on the surfaces of tendons

  • equilibrium

    Chemical equilibrium, a condition in the course of a reversible chemical reaction in which no net change in the amounts of reactants and products occurs. A reversible chemical reaction is one in which the products, as soon as they are formed, react to produce the original reactants. At equilibrium,

  • equilibrium (economics)

    international payment and exchange: Equilibrating short-term capital movements: Commercial banks and other corporations involved in dealings across currency frontiers are usually able to see some (but not necessarily all) of their needs in advance. Their foreign exchange experts will watch the course of the exchanges closely and, if a…

  • equilibrium (physics)

    Equilibrium, in physics, the condition of a system when neither its state of motion nor its internal energy state tends to change with time. A simple mechanical body is said to be in equilibrium if it experiences neither linear acceleration nor angular acceleration; unless it is disturbed by an

  • equilibrium constant (chemistry)

    acid–base reaction: Acid–base equilibria: The equilibrium constant (Ks′) for this reaction (the mathematical quantity that expresses the relationships between the concentrations of the various species present at equilibrium) would normally be given by the equation Ks′ = [SH2+] [S?]/[SH]2, in which the square brackets denote the concentrations of the species…

  • equilibrium line

    Arctic: Present-day glaciation: …equal is known as the equilibrium line and is roughly equivalent to the snow line. It frequently varies greatly over short distances and from year to year on a specific glacier. On Baffin Island the equilibrium line is a little more than 2,000 feet above sea level in the extreme…

  • equilibrium liquid line (chemistry)

    industrial glass: The glass transformation range: … which is known as the equilibrium liquid line. (Not shown in Figure 1 is the glass transition temperature, or Tg; this would be located at the lower end of the transformation range.) In crystallization, on the other hand, the transition from liquid to solid takes place with essentially a discontinuous…

  • equilibrium paradigm (ecology)

    patch dynamics: History of patch dynamics: …in ecology, having supplanted the equilibrium paradigm, which had been increasingly questioned. (The equilibrium paradigm posited that an ecosystem perturbed by a disturbance would eventually return to its undisturbed state, provided that the disturbance was not too strong or too damaging.) Patch dynamics is also conceptually linked with the theory…

  • equilibrium potential (biology)

    nervous system: Ions: …difference is then called the equilibrium potential. (It is also called the Nernst potential, after Walther Nernst, a German physical chemist who, in the late 19th century, developed equations for calculating the electrical potential at which there is no longer a net flux of a specific ion across a membrane.)

  • equilibrium price (economics)

    supply and demand: …is referred to as the equilibrium price and represents an agreement between producers and consumers of the good. In equilibrium the quantity of a good supplied by producers equals the quantity demanded by consumers.

  • equilibrium separation (chemistry)

    separation and purification: Separations based on equilibria: All equilibrium methods considered in this section involve the distribution of substances between two phases that are insoluble in one another. As an example, consider the two immiscible liquids benzene and water. If a coloured compound is placed in the water…

  • Equilibrium Series (art series by Koons)

    Jeff Koons: …floor polishers in vitrines; his Equilibrium series (1985) consisted of cast bronze flotation devices and basketballs suspended in fluid; and his Made in Heaven series (1990–91) was a group of erotic paintings and sculptures of Koons and his former wife, Italian porn star Cicciolina (Ilona Staller). Koons was an early…

  • equilibrium state (thermodynamics)

    thermodynamics: Thermodynamic equilibrium: A particularly important concept is thermodynamic equilibrium, in which there is no tendency for the state of a system to change spontaneously. For example, the gas in a cylinder with a movable piston will be at equilibrium if the temperature and pressure inside are uniform…

  • Equilibrium Unemployment Theory (work by Pissarides)

    Christopher A. Pissarides: …and policy, and his book Equilibrium Unemployment Theory (1990; 2nd ed. 2000) became a standard text in the field.

  • equimarginal principle (economics)

    economics: Theory of allocation: …particular examples of the “equimarginal principle,” a tool that can be applied to any decision that involves alternative courses of action. It is not only at the core of the theory of the firm and the theory of consumer behaviour, but it also underlies the theory of money, of…

  • equimolar countercurrent diffusion (measurement)

    gas: Diffusion: This method, called equimolar countercurrent diffusion, is the usual manner in which gaseous diffusion measurements are now carried out.

  • equine (mammal)

    Equine, one of the mammal family of Equidae (order Perissodactyla) that includes the modern horses, zebras, and asses, as well as more than 60 species known only from fossils. All six modern members of the family are placed in the genus Equus. Only the races of E. caballus (including the myriad

  • equine encephalitis (pathology)

    Equine encephalitis, severe viral disease of horses and mules. It sometimes affects birds, reptiles, and humans. Of the several strains of the virus, the most prevalent are the A group, which includes the Eastern, Western, and Venezuelan strains, and the B group, which includes the Japanese and

  • equine infectious anemia (pathology)

    Equine infectious anemia (EIA), disease of horses that is caused by a non-oncogenic (non-cancer-causing) retrovirus. Bloodsucking insects, especially horseflies, transmit the disease. Signs, which appear about two weeks after exposure, include fever, progressive weakness, weight loss, edema, and

  • equine plague (pathology)

    African horse sickness (AHS), disease of Equidae (horses, mules, donkeys, and zebras) caused by an orbivirus called AHSV (family Reoviridae) that is transmitted by arthropods, notably biting midges (Culicoides imicola). The disease, which is not usually fatal to indigenous zebra herds, is often

  • equine respiratory disease (pathology)

    Equine respiratory disease, a complex of infections of viral origin, including equine viral rhinopneumonitis (viral abortion), equine viral arteritis, equine influenza and parainfluenza, and equine rhinovirus infection. The diseases are clinically indistinguishable. All cause fever, coughing, and

  • equine syphilis (equine disease)

    Dourine, venereal disease of horses, caused by the protozoan Trypanosoma equiperdum. The disease, which involves paralysis, is incurable. Serum tests have largely eradicated it in advanced countries, where a positive test requires the destruction of the animal. Trypanosomiasis, also caused by

  • equinoctial precession cycle (geochronology)

    climate change: The last great cooling: …of Earth’s orbital geometry: the equinoctial precession cycle (23,000 years) and the axial-tilt cycle (41,000 years). Although the third parameter of Earth’s orbit, eccentricity, varies on a 100,000-year cycle, its magnitude is insufficient to explain the 100,000-year cycles of glacial and interglacial periods of the past 900,000 years. The origin…

  • equinox (astronomy)

    Equinox, either of the two moments in the year when the Sun is exactly above the Equator and day and night are of equal length; also, either of the two points in the sky where the ecliptic (the Sun’s annual pathway) and the celestial equator intersect. The vernal equinox, marking the beginning of

  • Equinox (work by Figes)

    Eva Figes: Equinox (1966) examines the breakup of a marriage and the protagonist’s subsequent struggle to rebuild her world. It was published about the time of the author’s own divorce from George Figes. Winter Journey (1967) relates a day in the life of an isolated old man.…

  • Equinox, Mount (mountain, Vermont, United States)

    Manchester: Mount Equinox (3,816 feet [1,163 metres]) is to the west. Hildene, the summer home of Robert Todd Lincoln, Abraham Lincoln’s son, has been preserved. Summer film and art festivals are held at the town’s Southern Vermont Art Center. Area 42 square miles (109 square km).…

  • equinoxes, precession of the (astronomy)

    Precession of the equinoxes, motion of the equinoxes along the ecliptic (the plane of Earth’s orbit) caused by the cyclic precession of Earth’s axis of rotation. In compiling his famous star catalog (completed in 129 bce), the Greek astronomer Hipparchus noticed that the positions of the stars were

  • équipe, Théatre de l’ (Algerian theatre)

    Albert Camus: Camus’s literary career: …(Workers’ Theatre, later named the Théatre de l’équipe), which aimed to bring outstanding plays to working-class audiences. He maintained a deep love of the theatre until his death. Ironically, his plays are the least-admired part of his literary output, although Le Malentendu (Cross Purpose) and Caligula, first produced in 1944…

  • equipotential (mathematics)

    principles of physical science: Potential: An example of equipotentials is shown in Figure 8. Each is determined by the equation 3/r1 ? 1/r2 = constant, with a different constant value for each, as shown. For any two charges of opposite sign, the equipotential surface, ? = 0, is a sphere, as no other…

  • equipotential mapping (geological science)

    Earth exploration: Electrical and electromagnetic methods: Equipotential methods entail mapping equipotential lines that result from a current. Distortions from a systematic pattern indicate the presence of a body of different resistivity. The mise-a-la-masse method involves putting one current electrode in an ore body in order to map its shape and location.

  • equipotential surface (physics)

    electricity: Electric potential: …this example is called an equipotential surface. When equation (5), which defines the potential difference between two points, is combined with Coulomb’s law, it yields the following expression for the potential difference VA ? VB between points A and B:

  • equipotentiality (psychology)

    Karl Lashley: Equipotentiality, associated chiefly with sensory systems such as vision, relates to the finding that some parts of a system take over the functions of other parts that have been damaged.

  • equiprobabilism (philosophy)

    probabilism: …century before the formulation of equiprobabilism (either of two equally probable opinions may be followed) by the moral theologian Alfonso Maria de’ Liguori, a doctor of the Roman Catholic church.

  • Equisetaceae (plant family)

    Equisetopsida: Annotated classification: …Calamitaceae, extinct tree horsetails; and Equisetaceae, herbaceous living horsetails and fossil allies with needlelike leaves in whorls along the stem; 15 extant species in the genus Equisetum and several extinct species in the genus Equisetites. The extant genus Equisetum is a small remnant of a once diverse and…

  • Equisetales (plant order)

    Equisetopsida: Annotated classification: Order Equisetales Two families: Calamitaceae, extinct tree horsetails; and Equisetaceae, herbaceous living horsetails and fossil allies with needlelike leaves in whorls along the stem; 15 extant species in the genus Equisetum and several extinct species in the genus Equisetites.

  • Equisetopsida (plant class)

    Equisetopsida, (division Pteridophyta), class of primitive spore-bearing vascular plants. Most members of the group are extinct and known only from their fossilized remains. The sole living genus, Equisetum, order Equisetales, is made up of 15 species of very ancient herbaceous plants, the

  • Equisetum (plant genus)

    Horsetail, (genus Equisetum), fifteen species of rushlike conspicuously jointed perennial herbs, the only living genus of plants in the order Equisetales and the class Equisetopsida. Horsetails grow in moist, rich soils in all parts of the world except Australasia. Some species produce two kinds of

  • Equisetum arvense (plant species)

    horsetail: …America and Eurasia is the common horsetail (E. arvense), about 30 cm (1 foot) tall. The central cavity of each stem is about a quarter of its outside diameter. Fairly thick, solid branches arise from below the sheaths, circling the shoots like spokes on a wheel. Stems that bear terminal…

  • Equisetum giganteum (plant species)

    horsetail: …slender South American species (E. giganteum), which sometimes grows to 10 metres (about 32 feet) in height with a diameter of about 2 cm (less than 1 inch) and is supported by the tall grasses and shrubs around it.

  • Equisetum hyemale (plant species)

    horsetail: Common scouring rush (E. hyemale), occurring in moist woods and on riverbanks, reaches well over a metre in height. The evergreen shoots often were used for scouring pots and pans in earlier times.

  • Equisetum sylvaticum (plant species)

    horsetail: Wood horsetail (E. sylvaticum) grows in moist, cool woods and has many delicate branches that circle the shoots. Variegated horsetail (E. variegatum) is evergreen and has black markings on the sheaths. Common scouring rush (E. hyemale), occurring in moist woods and on riverbanks, reaches well…

  • Equisetum telmateia (plant species)

    horsetail: …giant horsetail of Europe (E. telmateia) is about the same height as common scouring rush. The tallest of all horsetails is a slender South American species (E. giganteum), which sometimes grows to 10 metres (about 32 feet) in height with a diameter of about 2 cm (less than 1…

  • Equisetum variegatum (plant species)

    horsetail: Variegated horsetail (E. variegatum) is evergreen and has black markings on the sheaths. Common scouring rush (E. hyemale), occurring in moist woods and on riverbanks, reaches well over a metre in height. The evergreen shoots often were used for scouring pots and pans in earlier…

  • equitable lien (property law)

    lien: …possessory liens, there are also equitable and statutory liens. Courts of equity will in certain situations recognize a creditor’s interest in a debtor’s property even though the property remains in the debtor’s possession. An example of a statutory lien in general use in the United States is the mechanic’s lien,…

  • Equitable Life Assurance Company (American company)

    Henry Baldwin Hyde: …was the founder of the Equitable Life Assurance Society.

  • Equitable Life Assurance Society (American company)

    Henry Baldwin Hyde: …was the founder of the Equitable Life Assurance Society.

  • equitable ownership (trust law)

    property law: Trusts: …basic distinction between legal and equitable ownership is quite simple. The legal owner of the property (trustee) has the right to possession, the privilege of use, and the power to convey those rights and privileges. The trustee thus appears by all counts to be the owner of the property—or so…

  • equitable servitude (law)

    property: …a homeowners’ association fee), and equitable servitudes (such as a promise to use the property for residential purposes only). The civil law does not have as many categories, the category of “servitudes” tending to cover for them all, and the civil law is a bit more restrictive. Most of the…

  • equites (ancient Roman history)

    Eques, (Latin: “horseman”) in ancient Rome, a knight, originally a member of the cavalry and later of a political and administrative class as well as of the equestrian order. In early Rome the equites were drawn from the senatorial class and were called equites equo publico (“horsemen whose mounts

  • Equites (play by Aristophanes)

    Aristophanes: Knights: This play shows how little Aristophanes was affected by the prosecution he had incurred for Babylonians. Knights (424 bce; Greek Hippeis) consists of a violent attack on the same demagogue, Cleon, who is depicted as the favourite slave of the stupid and irascible Demos…

  • equity (accounting)

    bank: The role of bank capital: …also comes from share owners’ equity, which means that bank managers must concern themselves with the value of the bank’s equity capital as well as the composition of the bank’s assets and liabilities. A bank’s shareholders, however, are residual claimants, meaning that they may share in the bank’s profits but…

  • equity (law)

    Equity, in Anglo-American law, the custom of courts outside the common law or coded law. Equity provided remedies in situations in which precedent or statutory law might not apply or be equitable. By the end of the 13th century, the English king’s common-law courts had largely limited the relief

  • equity capital (accounting)

    bank: The role of bank capital: …also comes from share owners’ equity, which means that bank managers must concern themselves with the value of the bank’s equity capital as well as the composition of the bank’s assets and liabilities. A bank’s shareholders, however, are residual claimants, meaning that they may share in the bank’s profits but…

  • Equity Group Investments (American company)

    Sam Zell: In 1976 Zell founded Equity Group Investments (EGI). It and its partners amassed the country’s largest collection of U.S. office space mostly by identifying opportunities that other investors had overlooked. Although Zell’s investments also included railroad rolling stock, radio stations, trailer parks, insurance companies, and a minority stake in…

  • Equity League of Self-Supporting Women (American organization)

    Harriot Eaton Stanton Blatch: …name was changed to the Women’s Political Union, and in 1916 it was merged with the Congressional Union (later the National Woman’s Party) under Alice Paul.

  • equity, principle of (ethics)

    ethics: Early intuitionists: Cudworth, More, and Clarke: …also responsible for a “principle of equity,” which, though derived from the Golden Rule so widespread in ancient ethics, was formulated with a new precision: “Whatever I judge reasonable or unreasonable for another to do for me, that by the same judgment I declare reasonable or unreasonable that I…

  • equivalence (mathematics)

    automata theory: Equivalence and reduction: The most natural classification is by equivalence. If two machines (finite transducers) share the same inputs, then representative states from each are equivalent if every sequence x belonging to the set of words on the alphabet causes the same output from the…

  • equivalence (logic)

    Equivalence, in logic and mathematics, the formation of a proposition from two others which are linked by the phrase “if, and only if.” The equivalence formed from two propositions p and q also may be defined by the statement “p is a necessary and sufficient condition for

  • equivalence (chemistry)

    chemical compound: Proton magnetic resonance spectroscopy: …hydrogens are said to be equivalent. The two hydrogens on the CH2 group are also equivalent. The chemical shift of hydrogen atoms is the most important piece of information provided by NMR spectroscopy, because it reveals a great deal about the nature of the bonds around the hydrogen.

  • equivalence (prosody)

    Equivalence, in classical prosody, the principle that one long syllable is equal to two short ones. The principle is used as the basis for substitution in quantitative

  • equivalence class (mathematics)

    set theory: Relations in set theory: …form what is called the equivalence class of a. For example, the equivalence class of a line for the relation “is parallel to” consists of the set of all lines parallel to it.

  • equivalence of propositions (logic)

    Equivalence, in logic and mathematics, the formation of a proposition from two others which are linked by the phrase “if, and only if.” The equivalence formed from two propositions p and q also may be defined by the statement “p is a necessary and sufficient condition for

  • equivalence point (chemistry)

    chemical analysis: …of the analyte is the equivalence point and can be used to calculate the amount or concentration of the analyte that was originally present.

  • equivalence principle (physics)

    Equivalence principle, fundamental law of physics that states that gravitational and inertial forces are of a similar nature and often indistinguishable. In the Newtonian form it asserts, in effect, that, within a windowless laboratory freely falling in a uniform gravitational field, experimenters

  • equivalence relation (mathematics and logic)

    Equivalence relation, In mathematics, a generalization of the idea of equality between elements of a set. All equivalence relations (e.g., that symbolized by the equals sign) obey three conditions: reflexivity (every element is in the relation to itself), symmetry (element A has the same relation

  • equivalence transformation (logic)

    formal logic: Validity in PC: …is said to make an equivalence transformation.

  • equivalency (prosody)

    Equivalence, in classical prosody, the principle that one long syllable is equal to two short ones. The principle is used as the basis for substitution in quantitative

  • equivalent canonization (Christianity)

    St. Hildegard: …through the process of “equivalent canonization,” a papal proclamation of canonization based on a standing tradition of popular veneration. Later that year Benedict proclaimed Hildegard a doctor of the church, one of only four women to have been so named.

  • equivalent proportions, law of (chemistry)

    Equivalent weight, in chemistry, the quantity of a substance that exactly reacts with, or is equal to the combining value of, an arbitrarily fixed quantity of another substance in a particular reaction. Substances react with each other in stoichiometric, or chemically equivalent, proportions, and a

  • equivalent sound level (acoustics)

    noise pollution: Measuring and perceiving loudness: Another unit, called equivalent sound levels (Leq), can be used to express an average SPL over any period of interest, such as an eight-hour workday. (Leq is a logarithmic average rather than an arithmetic average, so loud events prevail in the overall result.) A unit called day-night sound…

  • equivalent tensile stress (physics)

    mechanics of solids: Inelastic response: equivalent tensile stress. The definition is made so that, for a state of uniaxial tension, σ equals the tensile stress, and the stress-strain relation for general stress states is formulated in terms of data from the tensile test. In particular, a plastic strain εp in…

  • equivalent weight (chemistry)

    Equivalent weight, in chemistry, the quantity of a substance that exactly reacts with, or is equal to the combining value of, an arbitrarily fixed quantity of another substance in a particular reaction. Substances react with each other in stoichiometric, or chemically equivalent, proportions, and a

  • equivocation (logical fallacy)

    fallacy: Verbal fallacies: …instances are as follows: (1) Equivocation occurs when a word or phrase is used in one sense in one premise and in another sense in some other needed premise or in the conclusion (example: “The loss made Jones mad [= angry]; mad [= insane] people should be institutionalized; so Jones…

  • Equuleus (constellation)

    Equuleus, (Latin: “Little Horse”) constellation in the northern sky at about 21 hours right ascension and 10° north in declination. Its brightest star is Kitalpha (from the Arabic for “part of a horse”), with a magnitude of 3.9. Ptolemy referred to this constellation as the head and neck of a

  • Equus (play by Shaffer)

    Equus, drama in two acts by Peter Shaffer, produced and published in 1973. It depicts a psychiatrist’s fascination with a disturbed teenager’s mythopoeic obsession with horses. The drama unfolds through the eyes of Martin Dysart, a psychiatrist and an amateur mythologist, who narrates the events of

  • Equus (film by Lumet [1977])

    Sidney Lumet: The 1970s: Serpico, Dog Day Afternoon, and Network: …these back-to-back hits, Lumet made Equus (1977), which Peter Shaffer adapted from his Broadway hit about a psychiatrist who is asked to treat a young man who is obsessed with horses. Some complained that the film literalized the play’s highly stylized symbolism, robbing the drama of much of its impact.…

  • Equus (mammal genus)

    horse: Evolution of the horse: …Pliohippus, the direct predecessor of Equus. Pliohippus fossils occur in the early to middle Pliocene beds of North America (the Pliocene Epoch lasted from about 5.3 million to 2.6 million years ago).

  • Equus africanus (mammal)

    ass: …horse family, Equidae, especially the African wild ass (Equus africanus) sometimes referred to as the true ass. The related Asiatic wild ass, sometimes called the Asian wild ass or the half-ass (E. hemionus), is usually known by the local names of its various races: e.g., kulan (E. hemionus kulan, Mongolia)…

  • Equus asinus (mammal)

    Donkey, (Equus asinus), domestic ass belonging to the horse family, Equidae, and descended from the African wild ass (Equus africanus; see ass). It is known to have been used as a beast of burden since 4000 bce. The average donkey stands 101.6 cm (40 inches) at the shoulder, but different breeds

  • Equus caballus (mammal)

    Horse, (Equus caballus), a hoofed herbivorous mammal of the family Equidae. It comprises a single species, Equus caballus, whose numerous varieties are called breeds. Before the advent of mechanized vehicles, the horse was widely used as a draft animal, and riding on horseback was one of the chief

  • Equus caballus caballus (extinct wild horse)

    Tarpan, European wild horse that survived in small herds in remote parts of central Europe during the Middle Ages but became extinct early in the 20th century. It is likely that late survivors crossed with domesticated horses. The Munich Zoo produced a tarpan-like horse by selective breeding of

  • Equus caballus przewalskii (wild horse subspecies)

    Przewalski’s horse, (subspecies Equus caballus przewalskii or E. ferus przewalskii), last wild horse subspecies surviving in the 21st century. It was discovered in western Mongolia in the late 1870s by the Russian explorer N.M. Przhevalsky. Przewalski’s horse is yellowish or light red (sometimes

  • Equus ferus przewalskii (wild horse subspecies)

    Przewalski’s horse, (subspecies Equus caballus przewalskii or E. ferus przewalskii), last wild horse subspecies surviving in the 21st century. It was discovered in western Mongolia in the late 1870s by the Russian explorer N.M. Przhevalsky. Przewalski’s horse is yellowish or light red (sometimes

  • Equus grevyi (mammal)

    perissodactyl: Zebras: Grevy’s zebra (E. grevyi), which shares a narrow zone in northern Kenya with the plains zebra, is confined to sparsely wooded, semidesert plains and low hills in northern Kenya, southern and eastern Ethiopia, and western Somaliland. Its status appears to be generally satisfactory.

  • Equus hemionus (mammal)

    ass: The related Asiatic wild ass, sometimes called the Asian wild ass or the half-ass (E. hemionus), is usually known by the local names of its various races: e.g., kulan (E. hemionus kulan, Mongolia) and khur (E. hemionus khur, India and Pakistan). The Syrian wild ass (E. hemionus…

  • Equus hemionus hemionus (mammal)

    perissodactyl: The wild horse: The chigetia or kulan (E. hemionus hemionus), which was formerly widespread over an immense region of the Gobi, now occurs only in semidesert steppe country in central Mongolia. Hunting and competition for water by pastoral tribesmen are responsible for its decline. The kulan is slightly smaller than the…

  • Equus hemionus kulan (mammal)

    perissodactyl: The wild horse: The chigetia or kulan (E. hemionus hemionus), which was formerly widespread over an immense region of the Gobi, now occurs only in semidesert steppe country in central Mongolia. Hunting and competition for water by pastoral tribesmen are responsible for its decline. The kulan is slightly smaller than the…

  • Equus kiang (mammal)

    Kiang, (Equus kiang), species of Asian wild ass found in the cold, arid highlands of Nepal, India, and Pakistan and in Qinghai and Gansu provinces and the western Tibet Autonomous Region in China at elevations above 4,000 metres (13,000 feet). The kiang’s coat is reddish in summer and brown, and it

  • Equus onager (mammal)

    Onager, (Equus onager), species of Asian wild ass that ranges from northwest Iran to Turkmenistan. The onager is pale-coloured and has a short erect mane and fairly large ears. It stands 1.5 metres (4.5 feet) at the shoulder and weighs about 250 kg (550 pounds). The onager was domesticated in

  • Equus quagga (mammal)

    perissodactyl: Zebras: The plains zebra (E. quagga) formerly inhabited a great area of grassland and savanna from the Cape to South Sudan. The southernmost race (E. quagga quagga), which was only partly striped, became extinct in the 19th century. The populations of the other races have been much…

  • Equus quagga boehmi (mammal)

    zebra: quagga boehmi (Grant’s zebra), E. quagga chapmani (Chapman’s zebra), E. quagga burchellii (Burchell’s zebra), and E. quagga quagga (quagga, which is extinct). The mountain zebra is made up of two subspecies: E. zebra hartmannae (Hartmann’s mountain zebra) and E. zebra zebra (

  • Equus quagga borensis (mammal)

    zebra: quagga borensis (half-maned zebra), E. quagga boehmi (Grant’s zebra), E. quagga chapmani (Chapman’s zebra), E. quagga burchellii (Burchell’s zebra), and E. quagga quagga (quagga, which is extinct). The mountain zebra is made up of two subspecies: E. zebra hartmannae (

  • Equus quagga burchellii (mammal)

    zebra: quagga burchellii (Burchell’s zebra), and E. quagga quagga (quagga, which is extinct). The mountain zebra is made up of two subspecies: E. zebra hartmannae (Hartmann’s mountain zebra) and E. zebra zebra (Cape Mountain zebra).

  • Equus quagga chapmani (mammal)

    zebra: quagga chapmani (Chapman’s zebra), E. quagga burchellii (Burchell’s zebra), and E. quagga quagga (quagga, which is extinct). The mountain zebra is made up of two subspecies: E. zebra hartmannae (Hartmann’s mountain zebra) and E. zebra zebra (Cape Mountain zebra).

  • Equus quagga crawshaii (mammal)

    zebra: quagga crawshaii (Crawshay’s zebra), E. quagga borensis (half-maned zebra), E. quagga boehmi (Grant’s zebra), E. quagga chapmani (Chapman’s zebra), E. quagga burchellii (Burchell’s zebra), and E. quagga quagga (quagga, which is extinct). The mountain zebra is made up

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