Sentence:  The events of the last quarter of an hour , mysterious to any bird accustomed only to the predictable life of coop and barnyard , had overcome the doctor 's hen and she gave out a series of <WSD>cackly</WSD> wails , perhaps mourning her nest , but briefly enjoyed . 
Meaning of the word marked with <WSD> tags:  like the cackles or squawks a hen makes especially after laying an egg