Related Clues:

• Queen's domain
• Safe havens
• Snug retreats
• Place for a clutch
• Fit one within another
• Fits in well
• Fits snugly
• Ornithologist's finds
• It may be lined with down
• Nidus
• It may go out on a limb
• Cozy spots
• Ants' homes
• Starting point for a flight test?
• Bird sanctuary