Rats

Rats can be found worldwide, cleverly adaptable to both natural and urban environments. They have been domesticated and can be found in most pet stores. Rats are intelligent and social creatures, often being quite affectionate and playful pets. All sorts of domestic varieties can be found, such as the common "fancy" rat, the dumbo rat, and hairless rat. They also appear in exotic colors such as blue and piebald.

Rats usually are portrayed as evil and dirty in film and other entertainment outlets, most likely linked with their inhabiting sewers, plague carrying capabilities, and light-on-their feet (and at times) sneaky behavior. Rats are actually tedious cleaners, sometimes over-cleaning themselves and other rats, known as "barbering."
Rats