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The rat is a medium-sized rodent. Rats are omnivores, they eat lots of different types of food. Most rats are in the genus Rattus. There are about 56 different species of rats. The best known rats are the black rat (Rattus rattus), and the brown rat (Rattus norvegicus). These two are known as Old World rats. The group has its origins in Asia. Usually rats are bigger than mice. Rats are large muroid rodents, mice are small ones. The muroid family is very large and complex. That means the terms rat and mouse are not specific in a taxonomic way. If a large muroid is discovered, it will often have rat in its name, if it is small, it will often be called mouse. Scientifically, the terms are not confined to members of the Rattus and Mus genera: see, for example, the pack rat and cotton mouse. Some people keep rats as a pet. They are called fancy rats. Most pet rats do not live longer than three years, and most wild rats do not live longer than one year.

INTO JAPANESE

ラットは中型の齧歯動物です。ネズミは雑食性で、さまざまな種類の食べ物をたくさん食べます。ほとんどのラットはRattus属に属しています。ラットには約56種類あります。 最もよく知られているラットは、クマネズミ（Rattus rattus）とドブネズミ（Rattus norvegicus）です。これらの2つは旧世界のネズミとして知られています。このグループの起源はアジアにあります。 ウス

BACK INTO ENGLISH

Rats are medium-sized rodents. Mice are omnivorous and eat a lot of different types of food. Most rats belong to the genus Rattus. There are about 56 types of rats. The most well-known rats are the rat rattus and the rat norvegic.

INTO JAPANESE

ラットは中型の齧歯動物です。マウスは雑食性で、さまざまな種類の食べ物をたくさん食べます。ほとんどのラットはRattus属に属しています。ネズミは約56種類あります。 最もよく知られているラットは、クマネズミとクマネズミです。

BACK INTO ENGLISH

Rats are medium-sized rodents. Mice are omnivorous and eat a lot of different types of food. Most rats belong to the genus Rattus. There are about 56 types of mice. The most well-known rats are the black rat and the black rat.

INTO JAPANESE

ラットは中型の齧歯動物です。マウスは雑食性で、さまざまな種類の食べ物をたくさん食べます。ほとんどのラットはRattus属に属しています。マウスは約56種類あります。 最もよく知られているネズミはクマネズミとクマネズミです。

BACK INTO ENGLISH

Rats are medium-sized rodents. Mice are omnivorous and eat a lot of different types of food. Most rats belong to the genus Rattus. There are about 56 types of mice. The most well-known mice are the black rat and the black rat.

INTO JAPANESE

ラットは中型の齧歯動物です。マウスは雑食性で、さまざまな種類の食べ物をたくさん食べます。ほとんどのラットはRattus属に属しています。マウスは約56種類あります。 最もよく知られているマウスは、クマネズミとクマネズミです。

BACK INTO ENGLISH

Rats are medium-sized rodents. Mice are omnivorous and eat a lot of different types of food. Most rats belong to the genus Rattus. There are about 56 types of mice. The most well-known mice are the black rat and the black rat.