Who said it?

"Say, Markham, come here a minute and tell me something. Did you ever hear of a name that sounded something like chickens? A man's... it doesn't have to be like chickens, though. Let's see. It might be fowl - no, that couldn't be it. Ducks, geese - what do you call them all? I mean in a bunch. Wait! Maybe it's poultry... something like poultry, maybe. _______! David _______!"

Okay, I'm gonna say that "who said it" is kind of apparent, but which tale did it come from and what is David's last name?  It's a Gibson story, if that helps.  Good luck agents.