“We have a saying in the union: "If a fellow looks like a duck and quacks like a duck and walks like a duck, the possibility is that he is a duck." That is the way with a Communist. If the guy does everything that the party does, the prospects are very good that he is a party member or fellow traveler.”

“When I see a bird that walks like a duck and swims like a duck, and quacks like a duck, I call that bird a duck. ”

“If it looks like a duck, and quacks like a duck, we have at least to consider the possibility that we have a small aquatic bird of the family Anatidae on our hands.”

“The strong appearance of design [in nature] allows a disarmingly simple argument: if it looks, walks and quacks like a duck, then, absent compelling evidence to the contrary, we have warrant to conclude it's a duck. Design should not be overlooked simply because it's so obvious.”

“I do not walk like a duck.”

“Duck was a neutral party, so he brought the ultimatum to the cows.”

“I shall never eat duck again. I cannot believe I used to like duck. The duck betrayed me.”

“Death strode away, stopped, and came back. He pointed a skeletal finger at The Duck Man.
WHY, he said, ARE YOU WALKING AROUND WITH THAT DUCK?
"What duck?"
AH. SORRY.”

“There was a certain history to this. While heavily pregnant with Amelia, she had asked him if she was radiant or if she just looked like a waddling duck. He told her she’d looked like a radiant duck. This had not been the correct answer.”

“I find a duck's opinion of me is very much influenced by whether or not I have bread. Ducks love bread, but they can't buy any. That's the biggest joke on the duck ever. (in addition to and along with this duck line- a bit from the Letterman show)”