Oliver is crazy about ducks at the moment. I suppose you could say he's "quackers" about them. (Sorry.)
Whenever he sees a duck, whether in a book or in reality, he says "quack, quack, quack" and imitates its beak quacking with his hand.
At "story-time" at the library the other day the story-teller was holding a duck puppet to help tell the tale. Well, Oliver was straight over to the front, barging everyone out of the way, and got up onto his knees to look over the duck as closely as possible. When the story was finished she put the duck on the stage, supposedly out of the way. But Oliver wasn't going to be stopped by this and was straight up there. Eventually Hayley had to ask its owner to hide it.
Of course, his love of ducks doesn't outweigh his love of bread, so he still eats their bread rather than feeding it to them.