Possible Clues:

• "Not a __ out of you!": "Shh!"
• Take a quick look at the shepherdess
• Least complaint
• Baby chick sound
• Look backwards as well as forwards
• Nest outcry
• Little sound
• There's little with this look to have lost the flock, Bo
• It's barely audible
• Go find the flock, Bo; look a little