Golden Feathers, (also called simply feathers), are types of items introduced in the GBA port of Donkey Kong Country 2: Diddy's Kong Quest. Golden Feathers are found in every level in the game, and are required to power up Expresso II for Expresso Racing.
There are forty Golden Feathers that must be collected in the game with all of them being hidden across all levels. Once found, the Kongs must return them to Cranky Kong to power up one of Expresso II's stats; Strength, Speed, Flight, and Boost by one point per feather. Each of these attributes can be upgraded ten times, meaning all of the Golden Feathers must be found to have Expresso II at maximum power when racing.