Otters are carnivorous mammals in the subfamily Lutrinae. The 13 extant otter species are all semiaquatic, aquatic or marine, with diets based on fish and invertebrates. Lutrinae is a branch of the weasel family Mustelidae, which includes badgers, honey badgers, minks and wolverines; the word otter derives from the Old English word oter. This, cognate words in other Indo-European languages stem from the Proto-Indo-European language root *wódr̥, which gave rise to the English word "water". An otter's den is called a couch. Male otters are called dogs or boars, females are called bitches or sows, their offspring are called pups; the collective nouns for otters are bevy, lodge, romp or, when in water, raft. The feces of otters are identified by their distinctive aroma, the smell of, described as ranging from freshly mown hay to putrefied fish; the gestation period in otters is about 60 to 86 days. The newborn pup is cared for by the bitch and older offspring. Bitch otters reach sexual maturity at two years of age and males at three years.
The holt is built under a rocky cairn, more common in Scotland. It is lined with moss and grass. After one month, the pup can leave the holt and after two months, it is able to swim; the pup lives with its family for one year. Otters live up to 16 years, its usual source of food is fish, further downriver, but it may sample frogs and birds. Otters have long, slim bodies and short limbs, their most striking anatomical features are the powerful webbed feet used to swim, their seal-like abilities holding breath underwater. Most have sharp claws on their feet and all except the sea otter have long, muscular tails; the 13 species range in adult size from 0.6 to 1 to 45 kg in weight. The Asian small-clawed otter is the smallest otter species and the giant otter and sea otter are the largest, they have soft, insulated underfur, protected by an outer layer of long guard hairs. This traps a layer of air which keeps them dry and somewhat buoyant under water. Several otter species have high metabolic rates to help keep them warm.
European otters must eat 15% of their body weight each day, sea otters 20 to 25%, depending on the temperature. In water as warm as 10 °C, an otter needs to catch 100 g of fish per hour to survive. Most species hunt for three to nursing mothers up to eight hours each day. For most otters, fish is the staple of their diet; this is supplemented by frogs and crabs. Some otters are experts at opening shellfish, others will feed on available small mammals or birds. Prey-dependence leaves otters vulnerable to prey depletion. Sea otters are hunters of sea urchins and other shelled creatures, they are notable for their ability to use stones to break open shellfish on their stomachs. This skill must be learned by the young. Otters are active hunters, chasing prey in the water or searching the beds of rivers, lakes or the seas. Most species live beside water, but river otters enter it only to hunt or travel, otherwise spending much of their time on land to prevent their fur becoming waterlogged. Sea otters are more aquatic and live in the ocean for most of their lives.
Otters are playful animals and appear to engage in various behaviors for sheer enjoyment, such as making waterslides and sliding on them into the water. They may find and play with small stones. Different species vary in their social structure, with some being solitary, while others live in groups – in a few species these groups may be large. Genus Lutra Eurasian otter Hairy-nosed otter Japanese otter† Lutra euxena† Lutra castiglionis† Lutra simplicidens† Lutra trinacriae†Genus Hydrictis Spotted-necked otter Genus Lutrogale Smooth-coated otter Lutrogale robusta†Genus Lontra North American river otter Southern river otter Neotropical river otter Marine otter Genus Pteronura Giant otter Genus Amblonyx Asian small-clawed otter Genus Aonyx African clawless otter Genus Enhydra Sea otter Enhydra reevei†Genus †Megalenhydris Genus †Sardolutra Genus †Algarolutra Genus †Cyrnaonyx Genus †Teruelictis Genus †Enhydriodon Genus †Enhydritherium Genus †Teruelictis Genus †Limnonyx Genus †Lutravus Genus †Sivaonyx Genus †Torolutra Genus †Tyrrhenolutra Genus †Vishnuonyx Genus †Siamogale The European otter called the Eurasian otter, inhabits Europe, most of Asia and parts of North Africa.
In the British Isles, they were common as as the 1950s, but became rare in many areas due to the use of chlorinated hydrocarbon pesticides, habitat loss and water pollution. Population levels are now recovering strongly; the UK Biodiversity Action Plan envisages the re-establishment of otters by 2010 in all the UK rivers and coastal areas they inhabited in 1960. Roadkill deaths have become one of the significant threats to the success of their re-establishment; the North American river otter became one of the major animals hunted and trapped for fur in North America after European contact. River otters eat a variety of fish and shellfish, as well as birds. They
Trout is the common name for a number of species of freshwater fish belonging to the genera Oncorhynchus and Salvelinus, all of the subfamily Salmoninae of the family Salmonidae. The word trout is used as part of the name of some non-salmonid fish such as Cynoscion nebulosus, the spotted seatrout or speckled trout. Trout are related to salmon and char: species termed salmon and char occur in the same genera as do fish called trout. Lake trout and most other trout live in freshwater lakes and rivers while there are others, such as the steelhead, which can spend two or three years at sea before returning to fresh water to spawn. Steelhead that live out their lives in fresh water are called rainbow trout. Arctic char and brook trout are part of the char family. Trout are an important food source for humans and wildlife, including brown bears, birds of prey such as eagles, other animals, they are classified as oily fish. The name'trout' is used for some species in three of the seven genera in the subfamily Salmoninae: Salmo, Atlantic species.
Fish referred to as trout include: Genus Salmo Adriatic trout, Salmo obtusirostris Brown trout, Salmo trutta River trout, S. t. morpha fario Lake trout/Lacustrine trout, S. t. morpha lacustris Sea trout, S. t. morpha trutta Flathead trout, Salmo platycephalus Marble trout, Soca River trout or Soča trout – Salmo marmoratus Ohrid trout, Salmo letnica, S. balcanicus, S. lumi, S. aphelios Sevan trout, Salmo ischchan Genus Oncorhynchus Biwa trout, Oncorhynchus masou rhodurus Cutthroat trout, Oncorhynchus clarki Coastal cutthroat trout, O. c. clarki Crescenti trout, O. c. c. f. crescenti Alvord cutthroat trout O. c. alvordensis Bonneville cutthroat trout O. c. utah Humboldt cutthroat trout O. c. humboldtensis Lahontan cutthroat trout O. c. henshawi Whitehorse Basin cutthroat trout Paiute cutthroat trout O. c. seleniris Snake River fine-spotted cutthroat trout, O. c. behnkei Westslope cutthroat trout O. c. lewisi Yellowfin cutthroat trout O. c. macdonaldi Yellowstone cutthroat trout O. c. bouvieri Colorado River cutthroat trout O. c. pleuriticus Greenback cutthroat trout O. c. stomias Rio Grande cutthroat trout O. c. virginalis Oncorhynchus gilae Gila trout, O. g. gilae Apache trout, O. g. apache Rainbow trout, Oncorhynchus mykiss Kamchatkan rainbow trout, Oncorhynchus mykiss mykiss Columbia River redband trout, Oncorhynchus mykiss gairdneri Coastal rainbow trout, Oncorhynchus mykiss irideus Beardslee trout, Oncorhynchus mykiss irideus var. beardsleei Great Basin redband trout, Oncorhynchus mykiss newberrii Golden trout, Oncorhynchus mykiss aguabonita Kern River rainbow trout, Oncorhynchus mykiss aguabonita var. gilberti Sacramento golden trout, Oncorhynchus mykiss aguabonita var. stonei Little Kern golden trout, Oncorhynchus mykiss aguabonita var. whitei Kamloops rainbow trout, Oncorhynchus mykiss kamloops Baja California rainbow trout, Nelson's trout, or San Pedro Martir trout, Oncorhynchus mykiss nelsoni Eagle Lake trout, Oncorhynchus mykiss aquilarum McCloud River redband trout, Oncorhynchus mykiss stonei Sheepheaven Creek redband trout Mexican golden trout, Oncorhynchus chrysogaster Genus Salvelinus Brook trout, Salvelinus fontinalis Aurora trout, S. f. timagamiensis Bull trout, Salvelinus confluentus Dolly Varden trout, Salvelinus malma Lake trout, Salvelinus namaycush Silver trout, † Salvelinus agassizi Hybrids Tiger trout, Salmo trutta X Salvelinus fontinalis Speckled Lake trout, Salvelinus namaycush X Salvelinus fontinalis Trout that live in different environments can have different colorations and patterns.
These colors and patterns form as camouflage, based on the surroundings, will change as the fish moves to different habitats. Trout in, or newly returned from the sea, can look silvery, while the same fish living in a small stream or in an alpine lake could have pronounced markings and more vivid coloration. In general trout that are about to breed have intense coloration, they can look like an different fish outside of spawning season. It is impossible to define a particular color pattern as belonging to a specific breed. Trout have fins without spines, all of them have a small adipose fin along the back, near the tail; the pelvic fins sit well back on each side of the anus. The swim bladder is connected to the esophagus, allowing for gulping or rapid expulsion of air, a condition known as physostome. Unlike many other physostome fish, trout do not use their bladder as an auxiliary device for oxygen uptake, relying on their gills. There are many species, more populations, that are isolated from each other and morphologically different.
However, since many of these distinct populations show no significant genetic differences, what may appear to be a large number of species is considered a much smaller number of distinct species by most ichthyologists. The trout found in the eastern United States are a good example of this; the brook trout, the aurora trout, the silver trout all have physical characteristics and colorations that distinguish them, yet genetic analysis shows that they are one species, Salvelinus fontinalis. Lake trout, like brook trout, belong to the char genus. Lake trout inhabit many of the larger lakes in North America, live m
The beaver is a large nocturnal, semiaquatic rodent. Castor includes the North American beaver and Eurasian beaver. Beavers are known for building dams and lodges, they are the second-largest rodent in the world. Their colonies create one or more dams to provide still, deep water to protect against predators, to float food and building material; the North American beaver population as of 1988 was 6 -- 12 million. This population decline is the result of extensive hunting for fur, for glands used as medicine and perfume, because the beavers' harvesting of trees and flooding of waterways may interfere with other land uses. Beavers, along with pocket gophers and kangaroo rats, are castorimorph rodents, a suborder of rodents restricted to North America. Although just two related species exist today, beavers have a long fossil history in the Northern Hemisphere beginning in the Eocene, many species of giant beaver existed until quite such as Trogontherium in Europe, Castoroides in North America. Beavers are known for their natural trait of building dams on rivers and streams, building their homes in the resulting pond.
Beavers build canals to float building materials that are difficult to haul over land. They use powerful front teeth to cut trees and other plants that they use both for building and for food. In the absence of existing ponds, beavers must construct dams before building their lodges. First they place vertical poles fill between the poles with a crisscross of horizontally placed branches, they fill in the gaps between the branches with a combination of weeds and mud until the dam impounds sufficient water to surround the lodge. They are known for their alarm signal: when startled or frightened, a swimming beaver will dive while forcefully slapping the water with its broad tail, audible over great distances above and below water; this serves as a warning to beavers in the area. Once a beaver has sounded the alarm, nearby beavers may not reemerge for some time. Beavers are slow on land, but are good swimmers, can stay under water for as long as 15 minutes. Beavers do not hibernate; some of the pile is above water and accumulates snow in the winter.
This insulation of snow keeps the water from freezing in and around the food pile, providing a location where beavers can breathe when outside their lodge. Beavers have webbed hind-feet, a broad, scaly tail, they have poor eyesight, but keen senses of hearing and touch. A beaver's teeth grow continuously, their four incisors are composed of hard orange enamel on a softer dentin on the back. The chisel-like ends of incisors are maintained by their self-sharpening wear pattern; the enamel in a beaver's incisors contains iron and is more resistant to acid than enamel in the teeth of other mammals. Beavers continue to grow throughout their lives. Adult specimens weighing over 25 kg are not uncommon. Females are as large as or larger than males of the same age, uncommon among mammals. Beavers live up to 24 years of age in the wild; the English word "beaver" comes from the Old English word beofor or befer, which in turn sprang from the Proto-Germanic root *bebruz. Cognates in other Germanic languages include the Old Saxon bibar, the Old Norse bjorr, the Middle Dutch and Dutch bever, the Low German bever, the Old High German bibar and the Modern German Biber.
The Proto-Germanic word in turn came from the Proto-Indo-European word *bhebhrus, a reduplication of the PIE root *bher-, meaning "brown" or "bright", whose own descendants now include the Lithuanian bebras and the Czech bobr, as well as the Germanic forms. The North American and Eurasian beavers are the only extant members of the family Castoridae, contained in a single genus, Castor. Genetic research has shown the modern European and North American beaver populations to be distinct species and that hybridization is unlikely. Although superficially similar to each other, there are several important differences between the two species. Eurasian beavers tend to be larger, with larger, less rounded heads, narrower muzzles, thinner and lighter underfur, less oval-shaped tails and shorter shin bones, making them less capable of bipedal locomotion than the North American species. Eurasian beavers have longer nasal bones than their North American cousins, with the widest point being at the end of the snout for the former, in the middle for the latter.
The nasal opening for the Eurasian species is triangular, unlike that of the North American race, square. The foramen magnum is rounded in the Eurasian triangular in the North American; the anal glands of the Eurasian beaver are larger and thin-walled with a large internal volume compared to that of the North American species. The guard hairs of the Eurasian beaver have a longer hollow medulla at their tips. Fur colour is different. Overall, 66% of Eurasian beavers have pale brown or beige fur, 20% have reddish brown, nearly 8% are brown and only 4% have blackish coats. In North American beavers, 50% have pale brown fur, 25% are reddish brown, 20% are brown and 6% are blackish; the two species are not genetically compatible. North American beavers have 40 chromosomes, while Eurasian beavers have 48. More than 27 attempts were made in Russia to hybridize the two species, with one breeding between a male North American beaver and a female European resulting in a single stillborn kit. Thes
Canada is a country in the northern part of North America. Its ten provinces and three territories extend from the Atlantic to the Pacific and northward into the Arctic Ocean, covering 9.98 million square kilometres, making it the world's second-largest country by total area. Canada's southern border with the United States is the world's longest bi-national land border, its capital is Ottawa, its three largest metropolitan areas are Toronto and Vancouver. As a whole, Canada is sparsely populated, the majority of its land area being dominated by forest and tundra, its population is urbanized, with over 80 percent of its inhabitants concentrated in large and medium-sized cities, many near the southern border. Canada's climate varies across its vast area, ranging from arctic weather in the north, to hot summers in the southern regions, with four distinct seasons. Various indigenous peoples have inhabited what is now Canada for thousands of years prior to European colonization. Beginning in the 16th century and French expeditions explored, settled, along the Atlantic coast.
As a consequence of various armed conflicts, France ceded nearly all of its colonies in North America in 1763. In 1867, with the union of three British North American colonies through Confederation, Canada was formed as a federal dominion of four provinces; this began an accretion of provinces and territories and a process of increasing autonomy from the United Kingdom. This widening autonomy was highlighted by the Statute of Westminster of 1931 and culminated in the Canada Act of 1982, which severed the vestiges of legal dependence on the British parliament. Canada is a parliamentary democracy and a constitutional monarchy in the Westminster tradition, with Elizabeth II as its queen and a prime minister who serves as the chair of the federal cabinet and head of government; the country is a realm within the Commonwealth of Nations, a member of the Francophonie and bilingual at the federal level. It ranks among the highest in international measurements of government transparency, civil liberties, quality of life, economic freedom, education.
It is one of the world's most ethnically diverse and multicultural nations, the product of large-scale immigration from many other countries. Canada's long and complex relationship with the United States has had a significant impact on its economy and culture. A developed country, Canada has the sixteenth-highest nominal per capita income globally as well as the twelfth-highest ranking in the Human Development Index, its advanced economy is the tenth-largest in the world, relying chiefly upon its abundant natural resources and well-developed international trade networks. Canada is part of several major international and intergovernmental institutions or groupings including the United Nations, the North Atlantic Treaty Organization, the G7, the Group of Ten, the G20, the North American Free Trade Agreement and the Asia-Pacific Economic Cooperation forum. While a variety of theories have been postulated for the etymological origins of Canada, the name is now accepted as coming from the St. Lawrence Iroquoian word kanata, meaning "village" or "settlement".
In 1535, indigenous inhabitants of the present-day Quebec City region used the word to direct French explorer Jacques Cartier to the village of Stadacona. Cartier used the word Canada to refer not only to that particular village but to the entire area subject to Donnacona. From the 16th to the early 18th century "Canada" referred to the part of New France that lay along the Saint Lawrence River. In 1791, the area became two British colonies called Upper Canada and Lower Canada collectively named the Canadas. Upon Confederation in 1867, Canada was adopted as the legal name for the new country at the London Conference, the word Dominion was conferred as the country's title. By the 1950s, the term Dominion of Canada was no longer used by the United Kingdom, which considered Canada a "Realm of the Commonwealth"; the government of Louis St. Laurent ended the practice of using'Dominion' in the Statutes of Canada in 1951. In 1982, the passage of the Canada Act, bringing the Constitution of Canada under Canadian control, referred only to Canada, that year the name of the national holiday was changed from Dominion Day to Canada Day.
The term Dominion was used to distinguish the federal government from the provinces, though after the Second World War the term federal had replaced dominion. Indigenous peoples in present-day Canada include the First Nations, Métis, the last being a mixed-blood people who originated in the mid-17th century when First Nations and Inuit people married European settlers; the term "Aboriginal" as a collective noun is a specific term of art used in some legal documents, including the Constitution Act 1982. The first inhabitants of North America are hypothesized to have migrated from Siberia by way of the Bering land bridge and arrived at least 14,000 years ago; the Paleo-Indian archeological sites at Old Crow Flats and Bluefish Caves are two of the oldest sites of human habitation in Canada. The characteristics of Canadian indigenous societies included permanent settlements, complex societal hierarchies, trading networks; some of these cultures had collapsed by the time European explorers arrived in the late 15th and early 16th centuries and have only been discovered through archeological investigations.
The indigenous population at the time of the first European settlements is estimated to have been between 200,000
Birch bark or birchbark is the bark of several Eurasian and North American birch trees of the genus Betula. The strong and water-resistant cardboard-like bark can be cut and sewn, which has made it a valuable building and writing material, since pre-historic times. Today, birch bark remains a popular type of wood for various handicrafts and arts. Birch bark contains substances of medicinal and chemical interest; some of those products have fungicidal properties that help preserve bark artifacts, as well as food preserved in bark containers. Removing birch bark from live trees is harmful to tree health and should be avoided. Instead, it can be removed easily from the trunk or branches of dead wood, by cutting a slit lengthwise through the bark and pulling or prying it away from the wood; the best time for collection is spring or early summer, as the bark is of better quality and most removed. Removing the outer layer of bark from the trunk of a living tree may not kill it, but weakens it and makes it more prone to infections.
Removal of the inner layer, the phloem, kills the tree by preventing the flow of sap to the roots. To prevent it from rolling up during storage, the bark kept pressed flat. Birch bark can be cut with a sharp knife, worked like cardboard. For sharp bending, the fold should be scored first with a blunt stylus. Fresh bark can be worked. Birch bark was a valuable construction material in any part of the world where birch trees were available. Containers like wrappings, baskets, boxes, or quivers were made by most societies well before pottery was invented. Other uses include: In various Asian countries birch bark was used to make storage boxes, tinder, roof coverings and waterproof covering for composite bows, such as the Mongol bow, the Chinese bow, Korean bow, Turkish bows, Assyrian bow, the Perso-Parthian bow....etc. It is still being used. More than one variety of birch is used. In North America, the native population used birch bark for canoes, scrolls, ritual art, torches, musical instruments and more.
In Scandinavia and Finland, it was used as the substratum of sod roofs and birch-bark roofs, for making boxes and buckets, fishing implements, shoes. In Russia, many birch bark manuscripts have survived from the Middle Ages. Birch bark knife handles are popular tools to be made currently. In India, birch-bark, along with dried palm leaves, were the primary writing supports before the widespread advent of paper in the second millennium CE; the oldest known Buddhist manuscripts, from Afghanistan, were written on birch bark. Neanderthals used birch bark to make a tar adhesive through the process of dry or destructive distillation. Birch bark makes an outstanding tinder, as the inner layers will stay dry through heavy rainstorms. Mazinibaganjigan Wiigwaasabak Wiigwaasi-makak Magewappa The Algonquin Birchbark Canoe, by David Gidmark. McPhee, The Survival of the Bark Canoe, Farrar and Giroux, New York, 1975. Adney, Edwin Tappan and Howard Chapelle, Bark Canoes and Skin Boats of North America, Skyhorse Publishing, Inc.
2007, 2014. Jennings, Bark Canoes: The Art and Obsession of Tappan Adney, Firefly Books Ltd. 2004. Behne, C. Ted, The Travel Journals of Tappan Adney, 1887-1890, Estate of Tappan Adney, 2010. Goode, F. W. Ojibwe Birch Bark Canoes: Anishinaabe Wigwassi-Jiimaan, Beaver Bark Canoes, 2012. Birchbark articles from the NativeTech site. Birch and Birch Bark, an article by John Zasada at a University of Minnesota site. Birch Bark Canoe page on the site of the Algonquins of Pikwàganagàn. César's Bark Canoe—Watch a documentary on how to build a Birch bark canoe Bureau of Catholic Indian Missions Digital Image Collection at Marquette University. Wiigwaasi-Jiimaan: These Canoes Carry Culture—Short documentary featuring the building of an Anishinaabe-Ojibwe birchbark canoe in Wisconsin
The raspberry is the edible fruit of a multitude of plant species in the genus Rubus of the rose family, most of which are in the subgenus Idaeobatus. Raspberries are perennial with woody stems. Raspberry derives its name from raspise, "a sweet rose-colored wine", from the Anglo-Latin vinum raspeys, or from raspoie, meaning "thicket", of Germanic origin; the name may have been influenced by its appearance as having a rough surface related to Old English rasp or "rough berry". Examples of raspberry species in Rubus subgenus Idaeobatus include: Rubus crataegifolius Rubus gunnianus Rubus idaeus Rubus leucodermis Rubus occidentalis Rubus parvifolius Rubus phoenicolasius Rubus rosifolius Rubus strigosus Rubus ellipticus Several species of Rubus called raspberries, are classified in other subgenera, including: Rubus deliciosus Rubus odoratus Rubus nivalis Rubus arcticus Rubus sieboldii Various kinds of raspberries can be cultivated from hardiness zones 3 to 9. Raspberries are traditionally planted in the winter as dormant canes, although planting of tender, plug plants produced by tissue culture has become much more common.
A specialized production system called "long cane production" involves growing canes for a year in a northern climate such as Scotland or Oregon or Washington, where the chilling requirement for proper bud break is attained, or attained earlier than the ultimate place of planting. These canes are dug and all, to be replanted in warmer climates such as Spain, where they flower and produce a early season crop. Plants are planted 2-6 per m in fertile, well drained soil. All cultivars of raspberries have perennial roots but, many do not have perennial shoots. In fact, most raspberries have shoots; the flowers can be a major nectar source for other pollinators. Raspberries can be locally invasive, they propagate using basal shoots, extended underground shoots that develop roots and individual plants. They can sucker new canes some distance from the main plant. For this reason, raspberries spread well, can take over gardens if left unchecked. Raspberries are propagated using cuttings, will root in moist soil conditions.
The fruit is harvested when it comes off the receptacle and has turned a deep color. This is when the fruits are sweetest. High tunnel bramble production offers the opportunity to bridge gaps in availability during late fall and late spring. Furthermore, high tunnels allow less hardy floricane-fruiting raspberries to overwinter in climates where they wouldn't otherwise survive. In the tunnel plants are established at close spacing prior to tunnel construction. Raspberries are an important commercial fruit crop grown in all temperate regions of the world. Many of the most important modern commercial red raspberry cultivars derive from hybrids between R. idaeus and R. strigosus. Some botanists consider the Eurasian and American red raspberries to belong to a single, circumboreal species, Rubus idaeus, with the European plants classified as either R. idaeus subsp. Idaeus or R. idaeus var. idaeus, the native North American red raspberries classified as either R. idaeus subsp. Strigosus, or R. idaeus var. strigosus.
Recent breeding has resulted in cultivars that are thornless and more upright, not needing staking. The black raspberry, Rubus occidentalis, is cultivated, providing both fresh and frozen fruit, as well as jams and other products, all with that species' distinctive flavor. Purple raspberries have been produced by horticultural hybridization of red and black raspberries, have been found in the wild in a few places where the American red and the black raspberries both grow naturally. Commercial production of purple-fruited raspberries is rare. Blue raspberry is a local name used in Prince Edward County, Canada for the cultivar'Columbian', a hybrid of R. strigosus and R. occidentalis. Fruits from such plants are called yellow raspberries. Most pale-fruited raspberries commercially sold in the eastern United States are derivatives of red raspberries. Yellow-fruited variants of the black raspberry are sometimes grown in home gardens. Red raspberries have been crossed with various species in other subgenera of the genus Rubus, resulting in a number of hybrids, the first of, the loganberry.
Notable hybrids include boysenberry, tayberry. Hybridization between the familiar cultivated red raspberries and a few Asiatic species of Rubus has been achieved. Numerous raspberry cultivars have been selected. Two types of raspberry are available for domestic cultivation.
Indigenous peoples of the Americas
The indigenous peoples of the Americas are the Pre-Columbian peoples of North and South America and their descendants. Although some indigenous peoples of the Americas were traditionally hunter-gatherers—and many in the Amazon basin, still are—many groups practiced aquaculture and agriculture; the impact of their agricultural endowment to the world is a testament to their time and work in reshaping and cultivating the flora indigenous to the Americas. Although some societies depended on agriculture, others practiced a mix of farming and gathering. In some regions the indigenous peoples created monumental architecture, large-scale organized cities, city-states, states and empires. Among these are the Aztec and Maya states that until the 16th century were among the most politically and advanced nations in the world, they had a vast knowledge of engineering, mathematics, writing, medicine and irrigation, mining and goldsmithing. Many parts of the Americas are still populated by indigenous peoples.
At least a thousand different indigenous languages are spoken in the Americas. Some, such as the Quechuan languages, Guaraní, Mayan languages and Nahuatl, count their speakers in millions. Many maintain aspects of indigenous cultural practices to varying degrees, including religion, social organization and subsistence practices. Like most cultures, over time, cultures specific to many indigenous peoples have evolved to incorporate traditional aspects but cater to modern needs; some indigenous peoples still live in relative isolation from Western culture and a few are still counted as uncontacted peoples. Indigenous peoples of the United States are known as Native Americans or American Indians and Alaska Natives. Application of the term "Indian" originated with Christopher Columbus, who, in his search for India, thought that he had arrived in the East Indies; those islands came to be known as the "West Indies", a name still used. This led to the blanket term "Indies" and "Indians" for the indigenous inhabitants, which implied some kind of racial or cultural unity among the indigenous peoples of the Americas.
This unifying concept, codified in law and politics, was not accepted by the myriad groups of indigenous peoples themselves, but has since been embraced or tolerated, by many over the last two centuries. Though the term "Indian" does not include the culturally and linguistically distinct indigenous peoples of the Arctic regions of the Americas—such as the Aleuts, Inuit or Yupik peoples, who entered the continent as a second more recent wave of migration several thousand years before and have much more recent genetic and cultural commonalities with the aboriginal peoples of the Asiatic Arctic Russian Far East—these groups are nonetheless considered "indigenous peoples of the Americas". Indigenous peoples are known in Canada as Aboriginal peoples, which includes not only First Nations and Arctic Inuit, but the minority population of First Nations-European mixed race Métis people who identify culturally and ethnically with indigenous peoplehood; this is contrasted, for instance, to the American Indian-European mixed race mestizos of Hispanic America who, with their larger population, identify as a new ethnic group distinct from both Europeans and Indigenous Americans, but still considering themselves a subset of the European-derived Hispanic or Brazilian peoplehood in culture and ethnicity.
The term Amerindian and its cognates find preferred use in scientific contexts and in Quebec, the Guianas and the English-speaking Caribbean. Indígenas or pueblos indígenas is a common term in Spanish-speaking countries and pueblos nativos or nativos may be heard, while aborigen is used in Argentina and pueblos originarios is common in Chile. In Brazil, indígenas or povos indígenas are common if formal-sounding designations, while índio is still the more often-heard term and aborígene and nativo being used in Amerindian-specific contexts; the Spanish and Portuguese equivalents to Indian could be used to mean any hunter-gatherer or full-blooded Indigenous person to continents other than Europe or Africa—for example, indios filipinos. The specifics of Paleo-Indian migration to and throughout the Americas, including the exact dates and routes traveled, are the subject of ongoing research and discussion. According to archaeological and genetic evidence and South America were the last continents in the world to gain human habitation.
During the Wisconsin glaciation, 50–17,000 years ago, falling sea levels allowed people to move across the land bridge of Beringia that joined Siberia to northwest North America. Alaska was a glacial refugium; the Laurentide Ice Sheet covered most of North America, blocking nomadic inhabitants and confining them to Alaska for thousands of years. Indigenous genetic studies suggest that the first inhabitants of the Americas share a single ancestral population, one that developed in isolation, conjectured to be Beringia; the isolat