RAT
Rats are various medium-sized, long-tailed of the Muroidea. "True rats" are members of the genus Rattus, the most important of which to humans are the , Rattus rattus, and the, Rattus norvegicus. Many members of other rodent genera and families are also called rats and share many characteristics with true rats.
Rats are typically distinguished from by their size; rats are generally large rodents, while mice are generally small muroid rodents. The muroid family is very large and complex, and the common terms rat and mouse are not specific. Generally, when someone discovers a large muroid, its includes the term rat, while if it is small, the name includes the term mouse - scientifically, the terms are not confined to members of the Rattus and genera. Compare the taxonomic classification of the and rat.
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