Sentence:  She fell asleep leaning on her hand , hearing the house creaking as though it were a living a private life of its own these two hundred years , hearing the birds rustling in their cages and the occasional whirring of <WSD>wings</WSD> as one of them landed on the table and walked across the newspaper to perch in the crook of her arm . 
Meaning of the word marked with <WSD> tags:  a movable organ for flying (one of a pair)