Feather

Feathers are items dropped by chickens and parrots, as well as tamed cats as morning gifts.

Drops
Adult chickens drop 0–2 feathers upon death. The maximum is increased by 1 per level of Looting, for a maximum of 0-5 with Looting III.

Parrots drop 1–2 feathers upon death. The maximum is increased by 1 per level of Looting, for a maximum of 1-5 with Looting III.

Foxes that are holding a feather also have an 8.5%‌/100%‌ chance to drop the feather upon death. Alternatively, the player can drop a food item, causing the fox to drop the feather in favor of the food.

Gift
Tamed cats have a 16.13% chance of giving the player feathers as a "morning gift."

Helmet
While a feather cannot be equipped in the head slot in Survival mode, equipping it using commands causes it to appear completely upright unlike other items.

Trading
Expert-level fletcher villagers buy 24 feathers for an emerald as part of their trade.