When Scrooge was about the same age Huey, Dewey, and Louie are now, Fergus saw much potential in Scrooge. When Scrooge started shoeshining to raise some money for his poor family, Fergus secretly arranged for a ditchdigger to show up with filthy boots and pay young Scrooge with a dime. He hoped the hard work would build character, and that being paid with an American dime (worthless in Scotland) Scrooge would learn not to be naively trusting. It worked.
Fergus is an old white duck with glasses. He is about three feet tall. He has grey sideburns. He wears a brown bowler hat, a yellow collared shirt, a blue checkered necktie, and an open brown vest.