A rodent is a small furry mammal whose teeth never stop growing. The rodent species includes mice, rats, squirrels, beaver, and many more.

Mice are known for their shyness, and lemmings are tragically famous for their supposed mass suicides when their populations exceed food supplies, but when you call someone a rodent, it's an insult. It's akin to calling them a rat. You're suggesting they eat garbage, live in sewers and stand for all that is dirty and vile.

Definitions of rodent

n relatively small placental mammals having a single pair of constantly growing incisor teeth specialized for gnawing

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any of numerous small rodents typically resembling diminutive rats having pointed snouts and small ears on elongated bodies with slender usually hairless tails
any of various long-tailed rodents similar to but larger than a mouse
a rodent that is a member of the family Muridae
water rat
any of various amphibious rats
New World mouse
a variety of rodent
Ondatra zibethica, muskrat, musquash
beaver-like aquatic rodent of North America with dark glossy brown fur
Florida water rat, Neofiber alleni, round-tailed muskrat
of Florida wetlands
Sigmodon hispidus, cotton rat
destructive long-haired burrowing rat of southern North America and Central America
wood rat, wood-rat
any of various small short-tailed rodents of the northern hemisphere having soft fur grey above and white below with furred tails and large ears; some are hosts for Ixodes pacificus and Ixodes scapularis (Lyme disease ticks)
short-tailed Old World burrowing rodent with large cheek pouches
gerbil, gerbille
small Old World burrowing desert rodent with long soft pale fur and hind legs adapted for leaping
any of various short-tailed furry-footed rodents of circumpolar distribution
hedgehog, porcupine
relatively large rodents with sharp erectile bristles mingled with the fur
jumping mouse
any of several primitive mouselike rodents with long hind legs and no cheek pouches; of woodlands of Eurasia and North America
mouselike jumping rodent
small furry-tailed squirrel-like Old World rodent that becomes torpid in cold weather
a kind of arboreal rodent having a long bushy tail
prairie dog, prairie marmot
any of several rodents of North American prairies living in large complex burrows having a barking cry
stocky coarse-furred burrowing rodent with a short bushy tail found throughout the northern hemisphere; hibernates in winter
large semiaquatic rodent with webbed hind feet and a broad flat tail; construct complex dams and underwater lodges
Aplodontia rufa, mountain beaver, sewellel
bulky nocturnal burrowing rodent of uplands of the Pacific coast of North America; the most primitive living rodent
short-tailed rough-haired South American rodent
Dolichotis patagonum, mara
hare-like rodent of the pampas of Argentina
Hydrochoerus hydrochaeris, capibara, capybara
pig-sized tailless South American amphibious rodent with partly webbed feet; largest living rodent
Dasyprocta aguti, agouti
agile long-legged rabbit-sized rodent of Central America and South America and the West Indies; valued as food
Cuniculus paca, paca
large burrowing rodent of South America and Central America; highly esteemed as food
mountain paca
rodent of mountains of western South America
Myocastor coypus, coypu, nutria
aquatic South American rodent resembling a small beaver; bred for its fur
Chinchilla laniger, chinchilla
small rodent with soft pearly grey fur; native to the Andes but bred in captivity for fur
mountain chinchilla, mountain viscacha
a rodent native to the mountains of Chile and Peru and now bred in captivity
Lagostomus maximus, chinchillon, viscacha
gregarious burrowing rodent larger than the chinchillas
abrocome, chinchilla rat, rat chinchilla
ratlike rodent with soft fur and large ears of the Andes
mole rat
furry short-limbed tailless rodent resembling a true mole in habits and appearance; of eastern Europe and Middle East
mole rat
African rodent resembling a mole in habits and appearance
sand rat
small nearly naked African mole rat of desert areas
pocket rat
any of various rodents with cheek pouches
Mus musculus, house mouse
brownish-grey Old World mouse now a common household pest worldwide
Micromyx minutus, harvest mouse
small reddish-brown Eurasian mouse inhabiting e.g. cornfields
field mouse, fieldmouse
any nocturnal Old World mouse of the genus Apodemus inhabiting woods and fields and gardens
nude mouse
a mouse with a genetic defect that prevents them from growing hair and also prevents them from immunologically rejecting human cells and tissues; widely used in preclinical trials
Norway rat, Rattus norvegicus, brown rat
common domestic rat; serious pest worldwide
Rattus rattus, black rat, roof rat
common household pest originally from Asia that has spread worldwide
bandicoot rat, mole rat
burrowing scaly-tailed rat of India and Ceylon
jerboa rat
large Australian rat with hind legs adapted for leaping
beaver rat
amphibious rat of Australia and New Guinea
American harvest mouse, harvest mouse
any of several small greyish New World mice inhabiting e.g. grain fields
wood mouse
any of various New World woodland mice
dusky-footed wood rat
a wood rat with dusky feet
field mouse, vole
any of various small mouselike rodents of the family Cricetidae (especially of genus Microtus) having a stout short-tailed body and inconspicuous ears and inhabiting fields or meadows
Neotoma cinerea, bushytail woodrat, pack rat, packrat, trade rat
any of several bushy-tailed rodents of the genus Neotoma of western North America; hoards food and other objects
Neotoma floridana, eastern woodrat
large greyish-brown wood rat of the southeastern United States
Oryzomys palustris, rice rat
hardy agile rat of grassy marshes of Mexico and the southeastern United States
Cricetus cricetus, Eurasian hamster
a variety of hamster common to Europe and Asia
Mesocricetus auratus, Syrian hamster, golden hamster
small light-colored hamster often kept as a pet
gerbil of northern Africa
Meriones unguiculatus, tamarisk gerbil
a gerbil that is popular as a pet
Meriones longifrons, sand rat
southern European gerbil
European lemming, Lemmus lemmus
notable for mass migrations even into the sea where many drown
Lemmus trimucronatus, brown lemming
of northwestern Canada and Alaska
gray lemming, grey lemming, red-backed lemming
Old World lemming
pied lemming
North American lemming having a white winter coat and some claws much enlarged
Synaptomys cooperi, southern bog lemming
of low bogs and meadows of northeastern and central United States and southern Canada
Synaptomys borealis, northern bog lemming
of wet alpine and subalpine meadows of Canada and Alaska
Old World porcupine
terrestrial porcupine
New World porcupine
arboreal porcupine
Zapus hudsonius, meadow jumping mouse
widely distributed in northeastern and central United States and Canada
typical jerboa
small nocturnal jumping rodent with long hind legs; of arid parts of Asia and northern Africa
Jaculus jaculus
a variety of jerboa
Glis glis, loir
large European dormouse
Muscardinus avellanarius, hazel mouse
a variety of dormouse
dormouse of southern Europe and northern Africa
tree squirrel
any typical arboreal squirrel
gopher, ground squirrel, spermophile
any of various terrestrial burrowing rodents of Old and New Worlds; often destroy crops
Cynomys ludovicianus, blacktail prairie dog
tail is black tipped
Cynomys gunnisoni, whitetail prairie dog
tail is white tipped
Tamias striatus, eastern chipmunk, ground squirrel, hackee, striped squirrel
small striped semiterrestrial eastern American squirrel with cheek pouches
a burrowing ground squirrel of western America and Asia; has cheek pouches and a light and dark stripe running down the body
Eutamius asiaticus, Eutamius sibiricus, baranduki, baronduki, barunduki, burunduki
terrestrial Siberian squirrel
American flying squirrel
New World flying squirrels
Marmota monax, groundhog, woodchuck
reddish brown North American marmot
Marmota caligata, hoary marmot, whistler, whistling marmot
large North American mountain marmot
Marmota flaviventris, rockchuck, yellowbelly marmot
heavy-bodied yellowish-brown marmot of rocky areas of western North America
Asiatic flying squirrel
nocturnal rodent of Asia having furry folds of skin between forelegs and hind legs enabling it to move by gliding leaps
Castor fiber, Old World beaver
a European variety of beaver
Castor canadensis, New World beaver
a variety of beaver found in almost all areas of North America except Florida
Cavia cobaya, guinea pig
stout-bodied nearly tailless domesticated cavy; often kept as a pet and widely used in research
Cavia porcellus, aperea, wild cavy
South American cavy; possibly ancestral to the domestic guinea pig
Type of:
eutherian, eutherian mammal, placental, placental mammal
mammals having a placenta; all mammals except monotremes and marsupials

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