After the war between the frat boys and the hippies is over, if you completed the McMillicancuddy's Farm quest then you can adventure in the farm again, this time presented as a single zone. All the ducks from all of the sub-zones in the original quest (except the generic duck) appear here, even if you did not fight them during the original quest.
You are permitted to adventure here only {variable} times before receiving this message:
You wander around the farm for a while, but can't find any additional ducks to fight. Maybe some more will come out of hiding by tomorrow.