eutherian, eutherian mammal, placental, placental mammal - mammals having a placenta; all mammals except monotremes and marsupials

order Rodentia, Rodentia - small gnawing animals: porcupines; rats; mice; squirrels; marmots; beavers; gophers; voles; hamsters; guinea pigs; agoutis

mouse - any of numerous small rodents typically resembling diminutive rats having pointed snouts and small ears on elongated bodies with slender usually hairless tails

rat - any of various long-tailed rodents similar to but larger than a mouse

murine - a rodent that is a member of the family Muridae

water rat - any of various amphibious rats

New World mouse - a variety of rodent

musquash, Ondatra zibethica, muskrat - beaver-like aquatic rodent of North America with dark glossy brown fur

Florida water rat, Neofiber alleni, round-tailed muskrat - of Florida wetlands

cotton rat, Sigmodon hispidus - 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 gray above and white below with well-furred tails and large ears; some are hosts for Ixodes pacificus and Ixodes scapularis (Lyme disease ticks)

hamster - 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

lemming - 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

jerboa - mouselike jumping rodent

dormouse - small furry-tailed squirrel-like Old World rodent that becomes torpid in cold weather

squirrel - 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

marmot - stocky coarse-furred burrowing rodent with a short bushy tail found throughout the northern hemisphere; hibernates in winter

beaver - 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

cavy - short-tailed rough-haired South American rodent

Dolichotis patagonum, mara - hare-like rodent of the pampas of Argentina

capibara, capybara, Hydrochoerus hydrochaeris - pig-sized tailless South American amphibious rodent with partly webbed feet; largest living rodent

agouti, Dasyprocta aguti - 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

coypu, Myocastor coypus, nutria - aquatic South American rodent resembling a small beaver; bred for its fur

Chinchilla laniger, chinchilla - small rodent with soft pearly gray 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

chinchillon, Lagostomus maximus, 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