Rats are various medium-sized, long-tailed
rodents.
Species of rats are all found in Rodentia, and are present throughout the order. Typical rats are found in the genus
Rattus.
Rats are typically distinguished from
mice by their size. Generally, when someone discovers a large
muroid rodent, its
common name includes the term
rat, while if it is smaller, the name includes the term
mouse. Common terms
rat and
mouse are not
taxonomically specific. Scientifically, the term rat is not confined to members of the
Rattus for example, the
pack rat.
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