Well, because they are the best small animal to keep as a pet. They are easily trained, friendly, curious, and clean. They are also relatively easy and cheap to take care of. So read on and learn more about a great small pet.
Rats have wonderful personalities and really enjoy the company of people.
You will quickly learn that each rat has it's own personality. Some may be adventurous and outgoing, while others may be laid-back and cuddly. My rats go nuts whenever they hear me enter the room and will hand upside down from the aquarium top until I feed or play with them. He leaps around in a circle, and then slaps the floor repeatedly with his front paws. All rats however are curious and when let out to play or put into a new environment will explore it's surroundings.