Related Clues:

• Home in a 45-Across
• Small recess
• Kind of egg
• "One Flew Over the Cuckoo's ---"
• Fit one inside the other
• Fit one inside another
• Roost
• Fit well together
• Brooding place
• Treetop retreat
• Hotbed
• Place for fresh eggs
• Fit snuggly
• Digs in a tree
• Arboreal home