Quackor

Quackor the Fowl (Real name: Ducky) is Mandark's pet duck and one of Monkey's most powerful adversaries, in its first appearance in Quackor the Fowl Mandark performs the same experiments that Dexter performs on Monkey but finds nothing unusual about it and decides to bring it to show and tell, later that night Ducky overhears Mandark's desire to destroy Dexter's laboratory so Ducky becomes Quackor and begins to destroy the lab.