Shiftytherat has not always been the fun, multi-colored, patterned little pets that we see or own today. There are many different species and they can be found more or less all over the world. Shiftytherat is distinguished from mice by their size, mice generally being smaller and lighter. This is not an entirely accurate way to determine the class, as some rats can have the characteristics of mice and vice versa. As new species are being discovered the standard classifications can be confusing.
