Temporal range: Late Palaeocene - Recent
They have four incisors that keep growing, and must be kept worn down by gnawing (eroding teeth by grinding them on something hard); this is the origin of the name, from the Latin rodere, "to gnaw", and dent, "tooth".
Rabbits, hares, and pikas are sometimes called rodents, because they also have teeth that keep growing. But in 1912 biologists decided to put them in a new, separate order, Lagomorpha, because they have two extra incisors in their upper jaw.
Taxonomy[change | change source]
- Order Rodentia
- Suborder Anumaluromorpha
- Suborder Castorimorpha
- Suborder Hystricomorpha
- Suborder Sciuromorpha
- Suborder Myomorpha
Other websites[change | change source]
|Wikimedia Commons has media related to: Rodentia|
|Wikispecies has information on: Rodentia.|