Wings (DK: Jungle Climber)
From the Super Mario Wiki
Wings are an item from the game DK: Jungle Climber. Taking this, Donkey Kong and Diddy Kong can fly over the level for a limited time. Pressing causes Donkey Kong to move the left wing and by pressing , the right wing will move. The Wings appears first in the level 2-3 of the game, named Road to Ruins. This item can be used only with Diddy Kong as a partner.