They appear only in the level Fireball Frenzy, where they hover in the background and periodically launch fireballs.
For example, the Gyrocopter somehow flies despite being made of entirely wood and barrels, plus one propeller.
This lets you travel to the clouds, where the Mother Banana Bird tasks you with finding all of the Banana Birds, at which point the Banana Birds magically free her and she drops a giant egg on K. The only way to visit her is to get all of the DK coins, which makes Funky pay out on his bet and gives the Kongs his Gyrocopter. Rool had cast a magic spell to trap the Mother Banana Bird, who lives in the clouds.
100% Completion: The 103% Completion ending.
In 2000, a Japan-only Updated Re-release was issued for the Game Boy Color, making this the only game in the Land series to be released exclusively for the updated console. Like the first two games in the Country series, the game received a follow-up in the form of Donkey Kong Land III, the third and (to date) final game in the Land series, for the original Game Boy. A back-to-basics follow-up, Donkey Kong Country Returns, was released by Retro Studios 14 years later, in 2010. Rare would go on to make one more game in the series, Donkey Kong 64, a 3D outing released in 1999. Has the distinction of being the final 2D Donkey Kong game produced by Rare, as well as the final game in the original trilogy. It even took some musical and aesthetic cues from James Bond (Rare was also working on GoldenEye (1997) at the time). It had a broad, cartoon-like art style and instead of a piratical/nautical theme, it featured motifs from the industrial revolution. The game featured better graphics than its predecessors, but also made several changes.