The bright western sun disappeared as the sky quickly darkened, and a low rumbling sound was heard in the humid air. There was a swift rushing of many feathered wings, yet not of bird. A great chattering and laughing filled the atmosphere and when the hot sun came out again, the light showed the Wicked Witch of the West that she was surrounded by a large crowd of wild monkeys, each with a pair of immense and powerful wings on his shoulders.The Wonderful Wizard of Oz (book) (1900) The Winged Monk