Family: Erethizontidae (New World porcupines)
Mexican hairy porcupine (Coendou mexicanus)
Family: Dasyproctidae (agoutis and pacas)
Central American agouti (Dasyprocta punctata)
Family: Echimyidae
Armored rat (Hoplomys gymnurus)
Tome’s spiny-rat (Proechimys semispinosus)
Family: Sciuridae (squirrels)
Alfaro’s pygmy squirrel squirrel (Microsciurus alfari)
Deppe’s squirrel (Sciurus deppei)
Red–tailed squirrel (Sciurus granatensis)
Variegated squirrel (Sciurus variegatoides)
Cherrie’s pocket gopher (Orthogeomys cherriei)
Family: Heteromyidae (Pocket mice)
Cloud Forest spiny pocket mouse (Heteromys oresterus)
Salvin’s spiny pocket mouse (Heteromys salvini)
Family: Cricetidae (New World Mice)
Sumichrast’s vesper rat (Nyctomys sumichrasti)
Big-eared climbing rat (Ototylomys phyllotis)
Watson’s climbing rat (Tylomys watsoni)
Mexican deer mouse (Peromyscus mexicanus)
Slender harvest mouse (Reithrodontomys gracilis)
Alston’s singing mouse (Scotinomys teguina)
Dusky rice rat (Melanomys caliginosus)
Fulvous pygmy rice rat (Oligoryzomys fulvescens)
Goldman’s water mouse (Rheomys raptor)
Family: Muridae (Old World Rats and Mice)
Mammals of Costa Rica 