Related Clues:

• Inner surface
• Lay eggs here
• Shelter in which to lay eggs
• Sent to a bird's home
• Snuggle in like bird
• Place to lay eggs
• Structure to lay eggs
• 'Birds in their little . . . . agree'
• Internal to
• Internal
• Structure built by birds
• Structure for laying eggs
• It takes a tug to bring one to a halt at sea
• I'd be like this: not out
• Give ear to this home if you're ardent enough