Related Clues:

• Treetop homes
• Fits snugly inside
• Tree nursery?
• Flier's home
• Wren den
• Nutcracker's suite?
• Resting places for frequent fliers?
• Twig creation
• Build a tree house
• Frequent landing spots
• Oriole's pad
• One's territory in part is cosy retreat
• Site for a diet of worms?
• Falcons' home
• Kill two birds with one stone - that includes birds' birthplace