Rodentia
Rodents make up the largest order of mammals, with over 40 percent of mammalian species. They have two incisors in the upper and lower jaw which grow continually and must be kept short by gnawing. Most rodents are small though the capybara (once introduced to the Great Britain, but subsequently eradicated) can weigh up to 45 kg (100 lb).
Family: Castoridae (beavers)
- Eurasian Beaver Castor fiber – reintroduced
Family: Cricetidae (voles)
- Bank Vole Myodes glareolus
- Skomer Vole M. g. skomerensis
- Field Vole Microtus agrestis
- Common Vole M. arvalis
- Orkney Vole or Cuttick M. a. orcadensis
- Water Vole Arvicola terrestris
Family: Muridae (rats, mice and relatives)
- Harvest Mouse Micromys minutus
- Wood Mouse Apodemus sylvaticus
- St Kilda Field Mouse A. s. hirtensis
- Yellow-necked Mouse A. flavicollis
- House Mouse Mus musculus
- St Kilda House Mouse M. m. muralis
- Black Rat Rattus rattus - Introduced
- Brown Rat R. norvegicus - Introduced
Family: Gliridae (dormice)
- Hazel Dormouse Muscardinus avellanarius
- Edible Dormouse Glis glis – Introduced
Family: Sciuridae (squirrels)
- Red Squirrel Sciurus vulgaris
- Grey Squirrel Sciurus carolinensis – Introduced
Read more about this topic: List Of Mammals Of Great Britain