Once a player gets their first duck in , they'll inevitably start amassing a collection of Duck Featherswith no apparent use.
Duck Feathers are generally produced daily by fully mature ducks. They drop randomly around the coop, not unlike eggs or Rabbit Feet.
They'll be picked up automatically by an Auto-Grabber, or can be manually collected by the player when they make their daily visit to the coop.
Having a couple of Duck Feathers is all well and good, but once players have multiple ducks, they'll likely be getting several per week.
This can lead to a massive pile of Duck Feathers collecting dust in a chest somewhere, as there are no apparent uses or crafting recipes that players can make with them.