Fievel Goes West

    Mouse In a Cage
    Mus musculus is often thought of as the second most successful mammal (humans being number one) on the earth today.  Of course, for this to have happened, house mice had to be able to change with the environment and stresses they encountered.  For starters, the house mouse is considered nomadic in that it is always having to move from one location to another.  For example when a field is cultivated and ground cover becomes scarce, mice will move to the next field.  As the weather cools, the mouse may move into homes or other buildings where shelter and food can be found.  Because of its close association with humans, house mice are able to live in very hot and dry conditions or in very cold conditions where they could not normally survive alone.
    The house mouse not only adapts by changing its location, the species also reproduces at such a high rate that there are always individuals that can survive.  Think of natural selection and mutations within species.  With many many house mice roaming around, there are bound to be at least a couple of them that have certain mutations that would be favorable in almost any circumstance. 
    Mice sense their environment much in the same way as other mammal species.  The house mouse has very good vision and hearing.  They are equipped with large, cup shaped ears to help sense sound vibrations.  They also have a good sense of smell and whiskers which they use to feel surface textures and air movements.