The tiger is the largest species among the Felidae and classified in the genus Panthera. It is most recognizable for its dark vertical stripes on reddish-orange fur with a lighter underside, it is an apex predator preying on ungulates such as deer and bovids. It is territorial and a solitary but social predator, requiring large contiguous areas of habitat, which support its requirements for prey and rearing of its offspring. Tiger cubs stay with their mother for about two years, before they become independent and leave their mother's home range to establish their own; the tiger once ranged from Eastern Anatolia Region in the west to the Amur River basin, in the south from the foothills of the Himalayas to Bali in the Sunda islands. Since the early 20th century, tiger populations have lost at least 93% of their historic range and have been extirpated in Western and Central Asia, from the islands of Java and Bali, in large areas of Southeast and South Asia and China. Today's tiger range is fragmented, stretching from Siberian temperate forests to subtropical and tropical forests on the Indian subcontinent and Sumatra.
The tiger is listed as Endangered on the IUCN Red List since 1986. As of 2015, the global wild tiger population was estimated to number between 3,062 and 3,948 mature individuals, down from around 100,000 at the start of the 20th century, with most remaining populations occurring in small pockets isolated from each other. Major reasons for population decline include habitat destruction, habitat fragmentation and poaching. This, coupled with the fact that it lives in some of the more densely populated places on Earth, has caused significant conflicts with humans; the tiger is among the most popular of the world's charismatic megafauna. It featured prominently in ancient mythology and folklore and continues to be depicted in modern films and literature, appearing on many flags, coats of arms and as mascots for sporting teams; the tiger is the national animal of India, Bangladesh and South Korea. The Middle English tigre and Old English tigras derive from Latin tigris; this was a borrowing of Classical Greek τίγρις'tigris', a foreign borrowing of unknown origin meaning'tiger' as well as the river Tigris.
The origin may have been the Persian word tigra meaning'pointed or sharp', the Avestan word tigrhi'arrow' referring to the speed of the tiger's leap, although these words are not known to have any meanings associated with tigers. The generic name Panthera is traceable to the Old French word'pantère', the Latin word panthera, the Ancient Greek word πάνθηρ'panther'; the Sanskrit word पाण्डर pând-ara means'pale yellow, white'. In 1758, Carl Linnaeus described the tiger in his work Systema Naturae and gave it the scientific name Felis tigris. In 1929, the British taxonomist Reginald Innes Pocock subordinated the species under the genus Panthera using the scientific name Panthera tigris; the tiger's closest living relatives were thought to be the Panthera species lion and jaguar. Results of genetic analysis indicate that about 2.88 million years ago, the tiger and the snow leopard lineages diverged from the other Panthera species, that both may be more related to each other than to the lion and jaguar.
P. T. palaeosinensis from the Early Pleistocene of northern China is the most primitive known tiger to date. Fossil remains of Panthera zdanskyi were excavated in Gansu province of northwestern China; this species lived at the beginning of the Pleistocene about two million years ago, is considered to be a sister taxon of the modern tiger. It was about the size of a jaguar and had a different coat pattern. Despite being considered more "primitive", it was functionally and also ecologically similar to the modern tiger. Northwestern China is thought to be the origin of the tiger lineage. Tigers grew in size in response to adaptive radiations of prey species like deer and bovids, which may have occurred in Southeast Asia during the early Pleistocene. Panthera tigris trinilensis lived about 1.2 million years ago and is known from fossils excavated near Trinil in Java. The Wanhsien, Ngandong and Japanese tigers became extinct in prehistoric times. Tigers reached India and northern Asia in the late Pleistocene, reaching eastern Beringia and Sakhalin.
Some fossil skulls are morphologically distinct from lion skulls, which could indicate tiger presence in Alaska during the last glacial period, about 100,000 years ago. Tiger fossils found in the island of Palawan were smaller than mainland tiger fossils due to insular dwarfism. Fossil remains of tigers were excavated in Sri Lanka, Japan, Sarawak dating to the late Pliocene and Early Holocene; the Bornean tiger was present in Borneo between the Late Pleistocene and the Holocene, but may have gone extinct in prehistoric times. The potential tiger range during the Late Pleistocene and Holocene was predicted applying ecological niche modelling based on more than 500 tiger locality records combined with bioclimatic data; the resulting model shows a contiguous tiger range from southern India to Siberia at the Last Glacial Maximum, indicating an unobstructed gene flow between tiger populations in mainland Asia throughout the Late Pleistocene and Holocene. The tiger populations on the Sunda Islands and mainland Asia were separated during interglacial periods.
Results of a phylogeographic study indicate that all living tigers had a common ancestor 72,000–108,000 years ago. The tiger's full genome sequence was published in 2013, it was found to have similar repeat composition to other cat genomes and an appreciably conserved synteny. Following Linnaeus's first descriptions of t
Natural history museum
A natural history museum or museum of natural history is a scientific institution with natural history collections that include current and historical records of animals, fungi, geology, paleontology and more. The primary role of a natural history museum is to provide the scientific community with current and historical specimens for their research, to improve our understanding of the natural world; some museums have public exhibits to share the beauty and wonder of the natural world with the public. Some museums feature non-natural history collections in addition to their primary collections, such as ones related to history and science. Renaissance cabinets of curiosities were private collections that included exotic specimens of natural history, sometimes faked, along with other types of object; the first natural history museum was that of Swiss scholar Conrad Gessner, established in Zürich in the mid-16th century. The Muséum national d'histoire naturelle, established in Paris in 1635, was the first natural history museum to take the form that would be recognized as a natural history museum today.
Early natural history museums offered limited accessibility, as they were private collections or holdings of scientific societies. The Ashmolean Museum, opened in 1683, was the first natural history museum to grant admission to the general public. Organised by the League of Nations, the first International Museography Congress happened in Madrid in 1934. Again, the First World Congress on the Preservation and Conservation of Natural History Collections took place in Madrid, from 10 May 1992 to 15 May 1992
The common eland known as the southern eland or eland antelope, is a savannah and plains antelope found in East and Southern Africa. It is a species of the family genus Taurotragus, it was first described by Peter Simon Pallas in 1766. An adult male is around 1.6 metres tall at the shoulder and can weigh up to 942 kg with an average of 500–600 kg, 340–445 kg for females). It is the second largest antelope in the world, being smaller on average than the giant eland. An herbivore, its diet is grasses and leaves. Common elands are not territorial; the common eland prefers habitats with a wide variety of flowering plants such as savannah and open and montane grasslands. It uses loud barks and postural movements and the flehmen response to communicate and warn others of danger; the common eland is used by humans for leather and rich, nutritious milk, has been domesticated in many areas. It is native to Angola, the Democratic Republic of the Congo, Kenya, Malawi, Namibia, South Africa, South Sudan, Tanzania, Uganda and Zimbabwe but is no longer present in Burundi.
While the common eland's population is decreasing, it is classified as "Least Concern" by the International Union for Conservation of Nature. The scientific name of the common eland is Taurotragus oryx, composed of three words: tauros and oryx. Tauros is Greek for a bullock, meaning the same as the Latin taurus. Tragos is Greek for a male goat, referring to the tuft of hair that grows in the eland's ear and its resemblance to a goat's beard. Oryx is Latin and Greek for pickaxe, referring to the pointed horns of North African antelopes like the common eland and scimitar-horned oryx; the name'eland' is Dutch for "elk" or "moose". It has a Baltic source similar to the Lithuanian élnis, which means "deer", it was borrowed earlier as ellan in the Elend. When Dutch settlers came to the Cape Province, they named it after the herbivorous moose. In Dutch the animal is called "Eland antelope" to distinguish it from the moose, found in the northern boreal forests. Common elands are spiral-horned antelopes.
They are sexually dimorphic, with females being smaller than the males. Females weigh 300–600 kg, measure 200–280 cm from the snout to the base of the tail and stand 125–153 cm at the shoulder. Bulls weigh 400–942 kg, are 240–345 cm from the snout to the base of the tail and stand 150–183 cm at the shoulder; the tail is 50–90 cm long. Male elands can weigh up to 1,000 kg, their coat differs geographically, with elands in north Africa having distinctive markings that are absent in the south. Apart from a rough mane, the coat is smooth. Females have a tan coat. Bulls may have a series of vertical white stripes on their sides; as males age, their coat becomes more grey. Males have dense fur on their foreheads and a large dewlap on their throats. Both sexes have horns with a steady spiral ridge; the horns are visible as small buds in newborns and grow during the first seven months. The horns of males are thicker and shorter than those of females, have a tighter spiral. Males use their horns during rutting season to wrestle and butt heads with rivals, while females use their horns to protect their young from predators.
The common eland is the slowest antelope, with a peak speed of 40 kilometres per hour that tires them quickly. However, they can maintain a 22 kilometres per hour trot indefinitely. Elands are capable of jumping up to 2.5 metres from a standing start. The common eland's life expectancy is between 15 and 20 years. Eland herds are accompanied by a loud clicking sound, subject to considerable speculation, it is believed that the weight of the animal causes the two halves of its hooves to splay apart, the clicking is the result of the hoof snapping together when the animal raises its leg. The sound carries some distance from a herd, may be a form of communication; the common eland was first described in 1766 by the German zoologist and botanist Peter Simon Pallas. It belongs to family Bovidae and subfamily Bovinae. Common elands are sometimes considered part of the genus Tragelaphus on the basis of molecular phylogenetics, but are categorized as Taurotragus, along with the giant eland. Three subspecies of common eland have been recognized.
T. o. oryx: called alces, barbatus and oreas. It is found in southwest Africa; the fur is tawny, adults lose their stripes. T. o. livingstonii: called kaufmanni, niediecki and triangularis. It is found in the Central Zambezian Miombo woodlands. Livingstone's eland has a brown pelt with up to twelve stripes. T. o. pattersonianus: called billingae. It is found in east Africa, hence its common name, its coat can have up to 12 stripes. Male elands have 31 diploid chromosomes and females hav
Oklahoma City shortened to OKC, is the capital and largest city of the U. S. state of Oklahoma. The county seat of Oklahoma County, the city ranks 27th among United States cities in population; the population grew following the 2010 Census, with the population estimated to have increased to 643,648 as of July 2017. As of 2015, the Oklahoma City metropolitan area had a population of 1,358,452, the Oklahoma City-Shawnee Combined Statistical Area had a population of 1,459,758 residents, making it Oklahoma's largest metropolitan area. Oklahoma City's city limits extend into Canadian and Pottawatomie counties, though much of those areas outside the core Oklahoma County area are suburban or rural; the city ranks as the ninth-largest city in the United States by total area when including consolidated city-counties. Lying in the Great Plains region, Oklahoma City has one of the world's largest livestock markets. Oil, natural gas, petroleum products and related industries are the largest sector of the local economy.
The city is in the middle of an active oil field and oil derricks dot the capitol grounds. The federal government employs large numbers of workers at Tinker Air Force Base and the United States Department of Transportation's Mike Monroney Aeronautical Center. Oklahoma City is on the I-35 Corridor, one of the primary travel corridors south into neighboring Texas and Mexico and north towards Wichita and Kansas City. Located in the state's Frontier Country region, the city's northeast section lies in an ecological region known as the Cross Timbers; the city was founded during the Land Run of 1889 and grew to a population of over 10,000 within hours of its founding. The city was the scene of the April 19, 1995 bombing of the Alfred P. Murrah Federal Building, in which 168 people died, it was the deadliest terror attack in the history of the United States until the attacks of September 11, 2001, remains the deadliest act of domestic terrorism in U. S. history. Since the time weather records have been kept, Oklahoma City has been struck by thirteen strong tornadoes.
Since 2008, Oklahoma City has been home to the National Basketball Association's Oklahoma City Thunder, who play their home basketball games at the Chesapeake Energy Arena. Oklahoma City was settled on April 22, 1889, when the area known as the "Unassigned Lands" was opened for settlement in an event known as "The Land Run"; some 10,000 homesteaders settled the area. The town grew quickly. Early leaders of the development of the city included Anton Classen, John Shartel, Henry Overholser and James W. Maney. By the time Oklahoma was admitted to the Union in 1907, Oklahoma City had surpassed Guthrie, the territorial capital, as the new state's population center and commercial hub. Soon after, the capital was moved from Guthrie to Oklahoma City. Oklahoma City was a major stop on Route 66 during the early part of the 20th century. Before World War II, Oklahoma City developed major stockyards, attracting jobs and revenue in Chicago and Omaha, Nebraska. With the 1928 discovery of oil within the city limits, Oklahoma City became a major center of oil production.
Post-war growth accompanied the construction of the Interstate Highway System, which made Oklahoma City a major interchange as the convergence of I-35, I-40, I-44. It was aided by federal development of Tinker Air Force Base. In 1950, the Census Bureau reported city's population as 8.6 % 90.7 % white. Patience Latting was elected Mayor of Oklahoma City in 1971. Latting was the first woman to serve as mayor of a U. S. city with over 350,000 residents. Like many other American cities, center city population declined in the 1970s and 1980s as families followed newly constructed highways to move to newer housing in nearby suburbs. Urban renewal projects in the 1970s, including the Pei Plan, removed older structures but failed to spark much new development, leaving the city dotted with vacant lots used for parking. A notable exception was the city's construction of the Myriad Gardens and Crystal Bridge, a botanical garden and modernistic conservatory in the heart of downtown. Architecturally significant historic buildings lost to clearances were the Criterion Theater, the Baum Building, the Hales Building, the Biltmore Hotel.
In 1993, the city passed a massive redevelopment package known as the Metropolitan Area Projects, intended to rebuild the city's core with civic projects to establish more activities and life to downtown. The city added a new baseball park. Water taxis transport passengers within the district, adding activity along the canal. MAPS has become one of the most successful public-private partnerships undertaken in the U. S. exceeding $3 billion in private investment as of 2010. As a result of MAPS, the population living in downtown housing has exponentially increased, together with demand for additional residential and retail amenities, such as grocery and shops. Since the MAPS projects' completion, the downtown area has seen continued
Vertebrates comprise all species of animals within the subphylum Vertebrata. Vertebrates represent the overwhelming majority of the phylum Chordata, with about 69,276 species described. Vertebrates include the jawless fishes and jawed vertebrates, which include the cartilaginous fishes and the bony fishes; the bony fishes in turn, cladistically speaking include the tetrapods, which include amphibians, reptiles and mammals. Extant vertebrates range in size from the frog species Paedophryne amauensis, at as little as 7.7 mm, to the blue whale, at up to 33 m. Vertebrates make up less than five percent of all described animal species; the vertebrates traditionally include the hagfish, which do not have proper vertebrae due to their loss in evolution, though their closest living relatives, the lampreys, do. Hagfish do, possess a cranium. For this reason, the vertebrate subphylum is sometimes referred to as "Craniata" when discussing morphology. Molecular analysis since 1992 has suggested that hagfish are most related to lampreys, so are vertebrates in a monophyletic sense.
Others consider them a sister group of vertebrates in the common taxon of craniata. The word vertebrate derives from the Latin word vertebratus. Vertebrate is derived from the word vertebra, which refers to any of the bones or segments of the spinal column. All vertebrates are built along the basic chordate body plan: a stiff rod running through the length of the animal, with a hollow tube of nervous tissue above it and the gastrointestinal tract below. In all vertebrates, the mouth is found at, or right below, the anterior end of the animal, while the anus opens to the exterior before the end of the body; the remaining part of the body continuing after the anus forms a tail with vertebrae and spinal cord, but no gut. The defining characteristic of a vertebrate is the vertebral column, in which the notochord found in all chordates has been replaced by a segmented series of stiffer elements separated by mobile joints. However, a few vertebrates have secondarily lost this anatomy, retaining the notochord into adulthood, such as the sturgeon and coelacanth.
Jawed vertebrates are typified by paired appendages, but this trait is not required in order for an animal to be a vertebrate. All basal vertebrates breathe with gills; the gills are carried right behind the head, bordering the posterior margins of a series of openings from the pharynx to the exterior. Each gill is supported by a cartilagenous or bony gill arch; the bony fish have three pairs of arches, cartilaginous fish have five to seven pairs, while the primitive jawless fish have seven. The vertebrate ancestor no doubt had more arches than this, as some of their chordate relatives have more than 50 pairs of gills. In amphibians and some primitive bony fishes, the larvae bear external gills, branching off from the gill arches; these are reduced in adulthood, their function taken over by the gills proper in fishes and by lungs in most amphibians. Some amphibians retain the external larval gills in adulthood, the complex internal gill system as seen in fish being irrevocably lost early in the evolution of tetrapods.
While the more derived vertebrates lack gills, the gill arches form during fetal development, form the basis of essential structures such as jaws, the thyroid gland, the larynx, the columella and, in mammals, the malleus and incus. The central nervous system of vertebrates is based on a hollow nerve cord running along the length of the animal. Of particular importance and unique to vertebrates is the presence of neural crest cells; these are progenitors of stem cells, critical to coordinating the functions of cellular components. Neural crest cells migrate through the body from the nerve cord during development, initiate the formation of neural ganglia and structures such as the jaws and skull; the vertebrates are the only chordate group to exhibit cephalisation, the concentration of brain functions in the head. A slight swelling of the anterior end of the nerve cord is found in the lancelet, a chordate, though it lacks the eyes and other complex sense organs comparable to those of vertebrates.
Other chordates do not show any trends towards cephalisation. A peripheral nervous system branches out from the nerve cord to innervate the various systems; the front end of the nerve tube is expanded by a thickening of the walls and expansion of the central canal of spinal cord into three primary brain vesicles: The prosencephalon and rhombencephalon, further differentiated in the various vertebrate groups. Two laterally placed eyes form around outgrowths from the midbrain, except in hagfish, though this may be a secondary loss; the forebrain is well developed and subdivided in most tetrapods, while the midbrain dominates in many fish and some salamanders. Vesicles of the forebrain are paired, giving rise to hemispheres like the cerebral hemispheres in mammals; the resulting anatomy of the central nervous system, with a single hollow nerve cord topped by a series of vesicles, is unique to vertebrates. All invertebrates with well-developed brains, such as insects and squids, have a ventral rather than dorsal system of ganglions, with a split brain stem running on each side of the mouth or gut.
Vertebrates originated about 525 million years ago during the Cambrian explosion, which saw
Birds known as Aves, are a group of endothermic vertebrates, characterised by feathers, toothless beaked jaws, the laying of hard-shelled eggs, a high metabolic rate, a four-chambered heart, a strong yet lightweight skeleton. Birds range in size from the 5 cm bee hummingbird to the 2.75 m ostrich. They rank as the world's most numerically-successful class of tetrapods, with ten thousand living species, more than half of these being passerines, sometimes known as perching birds. Birds have wings which are less developed depending on the species. Wings, which evolved from forelimbs, gave birds the ability to fly, although further evolution has led to the loss of flight in flightless birds, including ratites and diverse endemic island species of birds; the digestive and respiratory systems of birds are uniquely adapted for flight. Some bird species of aquatic environments seabirds and some waterbirds, have further evolved for swimming; the fossil record demonstrates that birds are modern feathered dinosaurs, having evolved from earlier feathered dinosaurs within the theropod group, which are traditionally placed within the saurischian dinosaurs.
The closest living relatives of birds are the crocodilians. Primitive bird-like dinosaurs that lie outside class Aves proper, in the broader group Avialae, have been found dating back to the mid-Jurassic period, around 170 million years ago. Many of these early "stem-birds", such as Archaeopteryx, were not yet capable of powered flight, many retained primitive characteristics like toothy jaws in place of beaks, long bony tails. DNA-based evidence finds that birds diversified around the time of the Cretaceous–Palaeogene extinction event 66 million years ago, which killed off the pterosaurs and all the non-avian dinosaur lineages, but birds those in the southern continents, survived this event and migrated to other parts of the world while diversifying during periods of global cooling. This makes them the sole surviving dinosaurs according to cladistics; some birds corvids and parrots, are among the most intelligent animals. Many species annually migrate great distances. Birds are social, communicating with visual signals and bird songs, participating in such social behaviours as cooperative breeding and hunting and mobbing of predators.
The vast majority of bird species are monogamous for one breeding season at a time, sometimes for years, but for life. Other species have breeding systems that are polygynous or polyandrous. Birds produce offspring by laying eggs, they are laid in a nest and incubated by the parents. Most birds have an extended period of parental care after hatching; some birds, such as hens, lay eggs when not fertilised, though unfertilised eggs do not produce offspring. Many species of birds are economically important as food for human consumption and raw material in manufacturing, with domesticated and undomesticated birds being important sources of eggs and feathers. Songbirds and other species are popular as pets. Guano is harvested for use as a fertiliser. Birds prominently figure throughout human culture. About 120–130 species have become extinct due to human activity since the 17th century, hundreds more before then. Human activity threatens about 1,200 bird species with extinction, though efforts are underway to protect them.
Recreational birdwatching is an important part of the ecotourism industry. The first classification of birds was developed by Francis Willughby and John Ray in their 1676 volume Ornithologiae. Carl Linnaeus modified that work in 1758 to devise the taxonomic classification system in use. Birds are categorised as the biological class Aves in Linnaean taxonomy. Phylogenetic taxonomy places Aves in the dinosaur clade Theropoda. Aves and a sister group, the clade Crocodilia, contain the only living representatives of the reptile clade Archosauria. During the late 1990s, Aves was most defined phylogenetically as all descendants of the most recent common ancestor of modern birds and Archaeopteryx lithographica. However, an earlier definition proposed by Jacques Gauthier gained wide currency in the 21st century, is used by many scientists including adherents of the Phylocode system. Gauthier defined Aves to include only the crown group of the set of modern birds; this was done by excluding most groups known only from fossils, assigning them, instead, to the Avialae, in part to avoid the uncertainties about the placement of Archaeopteryx in relation to animals traditionally thought of as theropod dinosaurs.
Gauthier identified four different definitions for the same biological name "Aves", a problem. Gauthier proposed to reserve the term Aves only for the crown group consisting of the last common ancestor of all living birds and all of its descendants, which corresponds to meaning number 4 below, he assigned other names to the other groups. Aves can mean all archosaurs closer to birds than to crocodiles Aves can mean those advanced archosaurs with feathers Aves can mean those feathered dinosaurs that fly Aves can mean the last common ancestor of all the living birds and all of its descendants (a "c
North America is a continent within the Northern Hemisphere and all within the Western Hemisphere. It is bordered to the north by the Arctic Ocean, to the east by the Atlantic Ocean, to the west and south by the Pacific Ocean, to the southeast by South America and the Caribbean Sea. North America covers an area of about 24,709,000 square kilometers, about 16.5% of the earth's land area and about 4.8% of its total surface. North America is the third largest continent by area, following Asia and Africa, the fourth by population after Asia and Europe. In 2013, its population was estimated at nearly 579 million people in 23 independent states, or about 7.5% of the world's population, if nearby islands are included. North America was reached by its first human populations during the last glacial period, via crossing the Bering land bridge 40,000 to 17,000 years ago; the so-called Paleo-Indian period is taken to have lasted until about 10,000 years ago. The Classic stage spans the 6th to 13th centuries.
The Pre-Columbian era ended in 1492, the transatlantic migrations—the arrival of European settlers during the Age of Discovery and the Early Modern period. Present-day cultural and ethnic patterns reflect interactions between European colonists, indigenous peoples, African slaves and their descendants. Owing to the European colonization of the Americas, most North Americans speak English, Spanish or French, their culture reflects Western traditions; the Americas are accepted as having been named after the Italian explorer Amerigo Vespucci by the German cartographers Martin Waldseemüller and Matthias Ringmann. Vespucci, who explored South America between 1497 and 1502, was the first European to suggest that the Americas were not the East Indies, but a different landmass unknown by Europeans. In 1507, Waldseemüller produced a world map, in which he placed the word "America" on the continent of South America, in the middle of what is today Brazil, he explained the rationale for the name in the accompanying book Cosmographiae Introductio:... ab Americo inventore... quasi Americi terram sive Americam.
For Waldseemüller, no one should object to the naming of the land after its discoverer. He used the Latinized version of Vespucci's name, but in its feminine form "America", following the examples of "Europa", "Asia" and "Africa". Other mapmakers extended the name America to the northern continent, In 1538, Gerard Mercator used America on his map of the world for all the Western Hemisphere; some argue that because the convention is to use the surname for naming discoveries, the derivation from "Amerigo Vespucci" could be put in question. In 1874, Thomas Belt proposed a derivation from the Amerrique mountains of Central America. Marcou corresponded with Augustus Le Plongeon, who wrote: "The name AMERICA or AMERRIQUE in the Mayan language means, a country of perpetually strong wind, or the Land of the Wind, and... the can mean... a spirit that breathes, life itself." The United Nations formally recognizes "North America" as comprising three areas: Northern America, Central America, The Caribbean.
This has been formally defined by the UN Statistics Division. The term North America maintains various definitions in accordance with context. In Canadian English, North America refers to the land mass as a whole consisting of Mexico, the United States, Canada, although it is ambiguous which other countries are included, is defined by context. In the United States of America, usage of the term may refer only to Canada and the US, sometimes includes Greenland and Mexico, as well as offshore islands. In France, Portugal, Romania and the countries of Latin America, the cognates of North America designate a subcontinent of the Americas comprising Canada, the United States, Mexico, Greenland, Saint Pierre et Miquelon, Bermuda. North America has been referred to by other names. Spanish North America was referred to as Northern America, this was the first official name given to Mexico. Geographically the North American continent has many subregions; these include cultural and geographic regions. Economic regions included those formed by trade blocs, such as the North American Trade Agreement bloc and Central American Trade Agreement.
Linguistically and culturally, the continent could be divided into Latin America. Anglo-America includes most of Northern America and Caribbean islands with English-speaking populations; the southern North American continent is composed of two regions. These are the Caribbean; the north of the continent maintains recognized regions as well. In contrast to the common definition of "North America", which encompasses the whole continent, the term "North America" is sometimes used to refer only to Mexico, the United States, Greenland; the term Northern America refers to the northern-most countries and territories of North America: the United States, Bermuda, St. Pierre and Miquelon and Greenland. Although the term does not refer to a unifie