The other rodents in the group have not formed this association, for whatever reason - it may be associated with size, specialized feeding habit or their habitat. For example, a rodent, rat or mouse may act different in a single family dwelling than they would in a large warehouse. There are, however, some behavioral characteristics that seem to be fairly constant. These characteristics will be pointed out in the following discussions. The difference between the Roof and Norway rat are demonstrated, as well as a young rat and mouse.
House mice are small and can enter buildings through openings very small.
Due to their small size, they may also be carried into buildings in merchandise or in items that have been in storage. The house mouse is adaptable and can survive in outdoor situations as well as within buildings. Mice are not alarmed when new items appear in their territory. In fact, they readily explore new items. Mice feed as nibblers.