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Lemming Film
A lemming is a small rodent, usually found in or near the Arctic in tundra biomes. Lemmings form the Family (biology), subfamily Arvicolinae (also known as Microtinae) together with voles and muskrats, which form part of the superfamily Muroidea, which also includes rats, mice, hamsters, and Gerbillinae, gerbils. In popular culture, a longstanding myth holds that they exhibit herd mentality and jump off cliffs, committing mass suicide. Description and habitat Lemmings measure around in length and weigh around . Lemmings are quite rounded in shape, with brown and black, long, soft fur. They have a very short tail, a stubby, hairy snout, short legs, and small ears. They have a flattened claw on the first digit of their front feet, which helps them to dig in the snow. They are Herbivore, herbivorous, feeding mostly on mosses and grasses. They also forage through the snow surface to find berries, leaves, shoots, roots, bulbs, and lichens. Lemmings choose their preferred dietary vege ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arvicolini
Arvicolini is a tribe of voles in the subfamily Arvicolinae. A 2021 study found that ''Arvicola'' may not belong in this group, instead being sister to the tribe Lagurini. List of species Tribe Arvicolini *Genus ''Arvicola'' - water voles ** European (or Northern) water vole, ''Arvicola amphibius (Arvicola terrestris)'' ** Southwestern (or Southern) water vole, ''Arvicola sapidus'' **Montane water vole, ''Arvicola scherman'' *Genus '' Blanfordimys'' **Afghan vole, ''Blanfordimys afghanus'' ** Bucharian vole, ''Blanfordimys bucharicus'' *Genus ''Chionomys'' - snow voles ** Caucasian snow vole, ''Chionomys gud'' ** European snow vole, ''Chionomys nivalis'' **Robert's snow vole, ''Chionomys roberti'' *Genus '' Lasiopodomys'' ** Brandt's vole, ''Lasiopodomys brandtii'' ** Plateau vole, ''Lasiopodomys fuscus'' ** Mandarin vole, ''Lasiopodomys mandarinus'' *Genus ''Lemmiscus'' ** Sagebrush vole, ''Lemmiscus curtatus'' *Genus ''Microtus'' - voles ** Insular vole, ''Microtus abbreviatus' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vole
Voles are small rodents that are relatives of lemmings and hamsters, but with a stouter body; a longer, hairy tail; a slightly rounder head; smaller eyes and ears; and differently formed molars (high-crowned with angular cusps instead of low-crowned with rounded cusps). They are sometimes known as meadow mice or field mice in North America. Vole species form the subfamily Arvicolinae with the lemmings and the muskrats. There are approximately 155 different vole species. Description Voles are small rodents that grow to , depending on the species. Females can have five to ten litters per year, though with an average lifespan of three months and requiring one month to adulthood, two litters is the norm. Gestation lasts for three weeks and the young voles reach sexual maturity in a month. As a result of this biological exponential growth, vole populations can grow very large within a short time. A mating pair can produce a hundred more voles in a year. Voles outwardly resemble s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Population Cycle
A population cycle in zoology is a phenomenon where populations rise and fall over a predictable period of time. There are some species where population numbers have reasonably predictable patterns of change although the full reasons for population cycles is one of the major unsolved ecological problems. There are a number of factors which influence population change such as availability of food, predators, diseases and climate. Occurrence in mammal populations Olaus Magnus, the Archbishop of Uppsala in central Sweden, identified that species of northern rodents had periodic peaks in population and published two reports on the subject in the middle of the 16th century. In North America, the phenomenon was identified in populations of the snowshoe hare. In 1865, trappers with the Hudson's Bay Company were catching plenty of animals. By 1870, they were catching very few. It was finally identified that the cycle of high and low catches ran over approximately a ten-year period. The mos ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Qiviut
Qiviuq gor qiviut l( ; Inuktitut syllabics: ᕿᕕᐅᖅ; Inuinnaqtun: qiviuq; Inupiaq: qiviu or qiviuqWolf A. Seiler (2012)Iñupiatun Eskimo Dictionary/ref> (sometimes spelled qiveut)) is the inner wool of the muskox. In Inuinnaqtun the same word can be used to refer any down such as the down feathers of birds. The muskox has a two-layered coat, and ''qiviut'' refers specifically to the soft underwool beneath the longer outer wool. The muskox sheds this layer of wool each spring. Qiviut is plucked from the coat of the muskox during the moult or gathered from objects the animals have brushed against; unlike sheep, the animals are not sheared. Much of the commercially available qiviut comes from Canada, and is obtained from the pelts of muskoxen after hunts. In Alaska, qiviut is obtained from farmed animals or gathered from the wild during the molt. Properties Qiviut is stronger and warmer than sheep's wool, and softer than cashmere wool. Wild muskoxen have qiviut fibres app ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Muskox
The muskox (''Ovibos moschatus'', in Latin "musky sheep-ox"), also spelled musk ox and musk-ox, plural muskoxen or musk oxen (in iu, ᐅᒥᖕᒪᒃ, umingmak; in Woods Cree: ), is a hoofed mammal of the family Bovidae. Native to the Arctic, it is noted for its thick coat and for the strong odor emitted by males during the seasonal rut, from which its name derives. This musky odor has the effect of attracting females during mating season. Its Inuktitut name "umingmak" translates to "the bearded one". Its Woods Cree names "mâthi-môs" and "mâthi-mostos" translate to "ugly moose" and "ugly bison", respectively. Muskoxen primarily live in Greenland and the Canadian Arctic of the Northwest Territories and Nunavut, with reintroduced populations in the American state of Alaska, the Canadian territory of Yukon, and Siberia, and an introduced population in Norway, part of which emigrated to Sweden, where a small population now lives. Evolution Extant relatives The muskox ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hibernation
Hibernation is a state of minimal activity and metabolic depression undergone by some animal species. Hibernation is a seasonal heterothermy characterized by low body-temperature, slow breathing and heart-rate, and low metabolic rate. It most commonly occurs during winter months. Although traditionally reserved for "deep" hibernators such as rodents, the term has been redefined to include animals such as bears and is now applied based on active metabolic suppression rather than any absolute decline in body temperature. Many experts believe that the processes of daily torpor and hibernation form a continuum and utilise similar mechanisms. The equivalent during the summer months is aestivation. Hibernation functions to conserve energy when sufficient food is not available. To achieve this energy saving, an endothermic animal decreases its metabolic rate and thereby its body temperature. Hibernation may last days, weeks, or months—depending on the species, ambient temperature ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Incisor
Incisors (from Latin ''incidere'', "to cut") are the front teeth present in most mammals. They are located in the premaxilla above and on the mandible below. Humans have a total of eight (two on each side, top and bottom). Opossums have 18, whereas armadillos have none. Structure Adult humans normally have eight incisors, two of each type. The types of incisor are: * maxillary central incisor (upper jaw, closest to the center of the lips) * maxillary lateral incisor (upper jaw, beside the maxillary central incisor) * mandibular central incisor (lower jaw, closest to the center of the lips) * mandibular lateral incisor (lower jaw, beside the mandibular central incisor) Children with a full set of deciduous teeth (primary teeth) also have eight incisors, named the same way as in permanent teeth. Young children may have from zero to eight incisors depending on the stage of their tooth eruption and tooth development. Typically, the mandibular central incisors erupt first, followed ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cyperaceae
The Cyperaceae are a family of graminoid (grass-like), monocotyledonous flowering plants known as sedges. The family is large, with some 5,500 known species described in about 90 genera, the largest being the "true sedges" genus ''Carex'' with over 2,000 species. These species are widely distributed, with the centers of diversity for the group occurring in tropical Asia and tropical South America. While sedges may be found growing in almost all environments, many are associated with wetlands, or with poor soils. Ecological communities dominated by sedges are known as sedgelands or sedge meadows. Some species superficially resemble the closely related rushes and the more distantly related grasses. Features distinguishing members of the sedge family from grasses or rushes are stems with triangular cross-sections (with occasional exceptions, a notable example being the tule which has a round cross-section) and leaves that are spirally arranged in three ranks. In comparison, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Herbivore
A herbivore is an animal anatomically and physiologically adapted to eating plant material, for example foliage or marine algae, for the main component of its diet. As a result of their plant diet, herbivorous animals typically have mouthparts adapted to rasping or grinding. Horses and other herbivores have wide flat teeth that are adapted to grinding grass, tree bark, and other tough plant material. A large percentage of herbivores have mutualistic gut flora that help them digest plant matter, which is more difficult to digest than animal prey. This flora is made up of cellulose-digesting protozoans or bacteria. Etymology Herbivore is the anglicized form of a modern Latin coinage, ''herbivora'', cited in Charles Lyell's 1830 ''Principles of Geology''.J.A. Simpson and E.S.C. Weiner, eds. (2000) ''The Oxford English Dictionary'', vol. 8, p. 155. Richard Owen employed the anglicized term in an 1854 work on fossil teeth and skeletons. ''Herbivora'' is derived from Latin ''herba' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mass Suicide
Mass suicide is a form of suicide, occurring when a group of people simultaneously kill themselves. Overview Mass suicide sometimes occurs in religious settings. In war, defeated groups may resort to mass suicide rather than being captured. Suicide pacts are a form of mass suicide that are sometimes planned or carried out by small groups of depressed or hopeless people. Mass suicides have been used as a form of political protest. Attitudes towards mass suicide change according to place and circumstance. People who resort to mass suicide rather than submit to what they consider intolerable oppression sometimes become the focus of a heroic myth. Such mass suicides might also win the grudging respect of the victors. On the other hand, the act of people resorting to mass suicide without being threatened – especially, when driven to this step by a charismatic religious leader, for reasons which often seem obscure – tends to be regarded far more negatively. Historical mass suic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Herd Mentality
Herd mentality, mob mentality or pack mentality describes how people can be influenced by their peers to adopt certain behaviors on a largely emotional, rather than rational, basis. When individuals are affected by mob mentality, they may make different decisions than they would have individually. Social psychologists study the related topics of group intelligence, crowd wisdom, groupthink, and deindividuation. History The idea of a " group mind" or "mob behavior" was first put forward by 19th-century social psychologists Gabriel Tarde and Gustave Le Bon. Herd behavior in human societies has also been studied by Sigmund Freud and Wilfred Trotter, whose book ''Instincts of the Herd in Peace and War'' is a classic in the field of social psychology. Sociologist and economist Thorstein Veblen's ''The Theory of the Leisure Class'' illustrates how individuals imitate other group members of higher social status in their consumer behavior. More recently, Malcolm Gladwell in ''The Tipp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gerbillinae
Gerbillinae is one of the subfamilies of the rodent family Muridae and includes the gerbils, jirds, and sand rats. Once known as desert rats, the subfamily includes about 110 species of African, Indian, and Asian rodents, including sand rats and jirds, all of which are adapted to arid habitats. Most are primarily active during the day, making them diurnal (but some species, including the common household pet, exhibit crepuscular behavior), and almost all are omnivorous. The gerbil got its name as a diminutive form of "jerboa," an unrelated group of rodents occupying a similar ecological niche. Gerbils are typically between long, including the tail, which makes up about half of their total length. One species, the great gerbil (''Rhombomys opimus''), originally native to Turkmenistan, can grow to more than . The average adult gerbil weighs about . One species, the Mongolian gerbil ('' Meriones unguiculatus''), also known as the ''clawed jird'', is a gentle and hardy animal th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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