From the Super Mario Wiki, the Mario encyclopedia
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A Golden Banana appears at the end of the passageway, which can only be accessed by Donkey Kong, but several Books are blocking the path to it. The Books endlessly and rapidly flap between two adjacent bookcases. Donkey Kong can only safely pass through the Books by using his Strong Kong ability. Books cannot be defeated and they vanish if they hit into Donkey Kong, who is injured by the attack unless his Strong Kong ability is active. If Donkey Kong stands in the path of a Book, it does not fly through him and instead glares at him then vanishes.