Red Feathers are the primary type of feathers found in the Banjo-Kazooie series.
Once Bottles the Mole taught Kazooie how to fly in Banjo-Kazooie, she was able to get airborne by jumping off a Flight Pad. However, while Kazooie was unable to gain altitude when flying, she could remedy this problem by using a Red Feather, allowing her to flutter upwards a small bit. Also, once Kazooie learned how to Beak Bomb, she could use the ability for the cost of one feather. While Banjo and Kazooie could only hold 50 Red Feathers at first, a spell from Cheato could double this amount.
In Banjo-Tooie, Red Feathers had the same purpose and capacities as they did in Kazooie. Drill Sergeant Jamjars, however, managed to teach Banjo and Kazooie the Talon Torpedo, which required five Red Feathers to use. With Cheato's code, the number of red feathers can be doubled from 100 to 200.