Super rat

A rat, born in New York, New York, that is more than 12 inches in length, that has been subjected to single combat experiences resulting in death and has repeatedly shown quick and swift victory. Capable of killing any rat it comes across.

A: how did you solve your apartment's rat problem?

B: I captured a 12 inch long rat and had him kill a bunch of other rats one at a time and made a super rat, he slaughtered them all.