Rat

Rats are various medium-sized, long-tailed rodents. Species of rats are found throughout the order Rodentia, but stereotypical rats are found in the genus Rattus. Other rat genera include Neotoma (pack rats), Bandicota (bandicoot rats) and Dipodomys (kangaroo rats).

Rats are typically distinguished from mice by their size. Generally, when someone discovers a large muroid rodent, its common nameincludes the term rat, while if it is smaller, its name includes the term mouse. The common terms rat and mouse are not taxonomicallyspecific. In other words, rat is not a scientific term; if it were, all rats would belong to the genus Rattus.

In When the Cold Breeze Blows Away, it will be happened in various events in during World War III :

Not only rats,it will have Trench rats,which could be food for soldiers and heroes of Grand Alliance in trenches but trench rats can run in their trenches and immunity from trench diseases.

And that is why Werman Reich,their soldiers and their people are both species mouses and species rats of Inkwell Isle, which can immunity from trench foot.