Sentence:  A farmer friend keeps a video camera in the barn so she can turn on her goat cam and observe her animals at any time of the day or night. A baby monitor picks up the sounds of a <WSD>nanny</WSD> when she goes into labor—if the <WSD>nanny</WSD> is one who changes the usual pitch of her voice or nervously bleats during kidding. 
Meaning of the word marked with <WSD> tags:  A female goat.