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mouse
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What is a mouse?
A mouse is a term applied to rodents with bodies less than 12 cm long. In a scientific context, the term refers to any of the 38 species in the genus Mus.
Mice have slender bodies, either blunt or tapered muzzles, thinly haired and prominent ears, narrow hind feet that have bald soles, and small, sharp claws. The tail may be about as long as the head and body, or it can be much shorter.
All species of Mus are native to Eurasia and Africa, ranging from lowlands to mountaintops. They are primarily nocturnal ground dwellers, but some can climb, leap, and swim well. Mice consume seeds, insects, and other invertebrates. The house mouse (Mus musculus) is native to Central Asia but can be found worldwide in association with humans.
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What type of animal is a mouse and to which group does it belong?
A mouse is a rodent belonging to the genus Mus. It is a common name applied to rodents with bodies less than 12 cm (5 inches) long. The house mouse (Mus musculus) is native to Central Asia but can be found worldwide.
Rodents are mammals characterized by upper and lower pairs of ever-growing rootless incisor teeth and are the largest group of mammals. The Mus genus, with its 38 species, falls under the Muridae family, the largest extant rodent family. Members of this family are referred to as murids or muroid rodents. Within Mus, there are four distinct groups: spiny mice (Pyromys), shrew-mice (Coelomys), rice field mice and the house mouse (Mus), and African mice (Nannomys).
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Where do mice typically live in the wild?
In their natural habitats, mice are primarily nocturnal ground dwellers, though some species can climb, leap, and swim. They often dig burrows and chambers, building nests of dry vegetation.
Different species of mice live in various habitats. For example, the Ryukyu mouse loosens soil with its teeth to create tunnels leading to a nest chamber. Forest species may build nests in rock crevices or under rotting tree trunks. Some species, such as the gray-bellied pygmy mouse, use pathways made by larger rodents instead of burrowing.
Species of the Mus genus are native to Eurasia and Africa, from lowlands to mountaintops. Some live in grasslands or grassy patches in forests, while others prefer tropical evergreen lowland and mountain forests near water sources. Some species are adaptable to different environments, including deserts, grasslands, savannas, and even houses.
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What do mice eat and what are their main predators?
Mice are primarily nocturnal ground dwellers, though some can climb, leap, and swim. They create burrows and nests from dry vegetation in grasslands and savannas.
Their diet varies by species. Outdoors, house mice eat seeds and insects, but indoors, they consume almost anything digestible. Other species consume plant parts, seeds, insects, and invertebrates. For example, the stomachs of gray-bellied pygmy mice contain plant parts, bark, insects (mostly beetles), and worms.
Mice are preyed upon by reptiles, mammals, and birds, especially owls, within their ecosystems.
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How do mice communicate and behave in groups?
Mice use chemoreception to communicate, particularly through urine odors controlled by genes in the major histocompatibility complex (MHC). With about 50 linked genetic variations, these proteins contribute to each mouse's unique chemical signature. Early in development, mice imprint on family odors, which they later use to compare potential mates.
As social animals, mice form dominance hierarchies, where each mouse is dominant over those below it and submissive to those above. Direct conflict is rare because a mouse typically yields to one of higher rank. Social behavior in animals, including mice, is defined by interactions, such as communication or disputes.
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What role do mice play in ecosystems and why are they important for scientific research?
Mice play a crucial role in their natural habitats as they are preyed upon by reptiles, mammals, and birds. They consume seeds, insects, and invertebrates, which contributes to seed dispersal and maintaining the balance of their ecosystems.
Mice are also important for scientific research because their genetic makeup is similar to that of humans, and they experience many of the same illnesses. Their short life cycles enable researchers to study the effects of treatments and genetic changes over entire lifespans or multiple generations in a relatively short period. Knockout and transgenic mice help scientists understand the roles of certain genes in human diseases.
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News •
mouse, (genus Mus), the common name generally but imprecisely applied to rodents found throughout the world with bodies less than about 12 cm (5 inches) long. In a scientific context, mouse refers to any of the 38 species in the genus Mus, which is the Latin word for mouse. The house mouse (Mus musculus), native to Central Asia, has established itself with human populations in many other parts of the world.
All rodents with a mouselike or ratlike body, regardless of body size or diagnostic traits, were described as species of Mus between 1758 and the late 1800s. Subsequent study shifted most of those species into many different groups, leaving Mus as a smaller, clearly defined genus with a particular combination of traits. Within the genus there are four distinctive groups: spiny mice (subgenus Pyromys), shrew-mice (subgenus Coelomys), rice field mice and the house mouse (subgenus Mus), and African mice (subgenus Nannomys).
General features
Mice have a slender body, blunt or tapered muzzle, scantily haired, prominent ears, narrow hind feet with bald soles, and sharp, small claws. The thinly furred tail appears hairless; it may be about as long as the head and body, or it can be much shorter. One of the largest is the flat-haired mouse (M. platythrix) of peninsular India, weighing about 18 grams (0.6 ounce), with a body 10 to 12 cm (4 to 4.7 inches) long and a shorter tail (7 to 8 cm [2.8 to 3.1 inches]). The smallest is probably the pygmy mouse (M. minutoides) of sub-Saharan Africa, weighing 3 to 12 grams (0.11 to 0.42 ounce), with a body 6 to 8 cm (2.3 to 3.1 inches) long and a short tail of 3 to 6 cm (1.2 to 2.3 inches).
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There is considerable variation in fur texture and colour among the species of Mus. At one extreme are the spiny-furred species in the subgenus Pyromys, whose upperparts and undersides are covered with flat, channeled spines nestled in soft underfur (juveniles are not spiny). At the other extreme are the shrew-mice from Sumatra (M. crociduroides) and Java (M. vulcani), whose soft, short, and dense coat appears woolly or velvety. All the other species have a soft or slightly coarse, moderately thick coat with short or long hairs. A colour combination common to many mice is gray to brown upperparts, white underparts, white feet, and a tail that is dark above and white below. Variations of this pattern include upperparts of buff, bluish gray, blackish gray, reddish brown, or chocolate brown, with underparts ranging from white to various shades of gray, sometimes tinged with silver or buff. The feet may be white or the same colour as the upperparts, and the tail may be bicoloured or uniformly dark gray to dark brown.
Natural history
Mice in their natural habitats are primarily nocturnal, although some will occasionally forage during the day. They are ground dwellers, although some species are also agile climbers and leapers as well as capable swimmers. A few are specialized burrowers rarely seen above ground. Most species, especially those living in savannas and grasslands, excavate burrows and chambers in which they build globular nests of dry vegetation. In an intact ecosystem, species of Mus, along with other small-bodied rodents, are preyed upon, sometimes to an appreciable degree, by reptiles, mammals, and birds (especially owls).
The simple but effective excavation technique of mice is exemplified by the Ryukyu mouse (M. caroli). This mouse loosens soil with its incisor teeth, carrying a load of debris in its mouth and piling it outside the burrow entrance or sometimes stacking loose soil inside the burrow and then pushing the pile out with its hind feet. In the diked rice fields of Thailand, small piles of soil below holes in the dike signal the presence of Ryukyu mice. Each hole is the opening to a tunnel extending upward to a nest chamber above water level, then to another opening on the other side of the dike. Forest species may also burrow, but most of them construct nests in rock crevices or beneath rotting tree trunks and brush piles on the forest floor. The gray-bellied pygmy mouse (M. triton) of sub-Saharan Africa, for example, apparently does not burrow but uses pathways made by larger rodents.
Diet varies among species. Outdoors the house mouse consumes seeds and insects; indoors it eats nearly anything digestible. Most other species eat a combination of plant parts (especially seeds), insects, and other invertebrates. Stomachs of gray-bellied pygmy mice caught in East Africa, for example, contained plant parts, pieces of bark, insects (mostly adult beetles), and worms.
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Depending upon the species and geographic region, mice may breed throughout the year or only during the wet seasons in southern latitudes and from spring to fall in northern latitudes. Except for the house mouse, which can produce up to 14 litters per year (1 to 12 offspring per litter), there is little information about the reproductive biology of most species. In the deserts of India, the little Indian field mouse (M. booduga) bears from 1 to 13 young per litter and breeds throughout the year. In Southeast Asia, the fawn-coloured mouse (M. cervicolor) has been reported to produce litters of two to six young in July and December. In East Africa, the pygmy mouse breeds during the wet seasons from April to June and September to December and bear litters of two to eight young.