Garvey is a street rat - well, gull - from the docks who befriended with the nephews. Casually he joins activities of the Junior Woodchucks without being a member.
Well Donald Duck generally dislike shim for being a bad influence on his boys, as Garvey never shows any respect to his authority as adult parent. So, when the nephews were in school one day, and Donald spottet Garvey taking liberty on his milk at the backdoor, he decided to give him a lesson.
He had never seen that orphan boy close enough to have a detailed impression, so when he approached the boy his usual tantrum somewhat faded like a boiling cattle thrown in an ice bucket. That boy was husky. More than that... he was BUFF. Even more muscular then Louie Duck, Doald had seen him unvoluntarily in his swim shorts or au naturel on their house boat, and he was shocked by the development of his nephew. Garvey's old shabby woolen jumper was streched tight over enormous packages of strength, the chest two unreal slabs of meat, shoulders triplle the size of Don's, his arms pulling the sleeves tight. Literally that brat was as broad as tall. Being so close he smelled a scent that reminded him of the locker rooms in the army. That kid smelled of power and physical presence.
Donald felt so utterly inferior to this boy, pathetic, and could just magine what brutal power was resting in that seagull.
"Got a problem Mister?", Garvey asked with a cocky, knowing face no boy should have when talking to an adult.
Casually he lifted his arm, the migthy tube of his arms bulking, audibly streching the fabric. Then, he made a fist and started to flex. The jumper never stood a chance, as the white feathered biceps errupted from the brown wool like a white plump mushroom, or better said, a vulcano of marble. The cloth ripped audibly.
"C'mon", the gull said, "touch me. I know you want to. And then, let's have a talk about your attitude."

Drawn by the one and only, majestic  redsilver