Possible Clues:

• Where there are so many birds you get lots of thieving
• You might think there's be a lot of crowding going on there, and maybe swindling too
• Joey's opener crossing Robin's first breeding ground
• Dilapidated tenement
• Castle nearby regularly overlooked breeding ground
• Breeding colony of seals or birds
• Part of garden's about to be replaced by duck's nesting area
• Stony garden has circle for a hundred nesting birds
• One on board early regularly to see breeding colony
• Eastern track below castle is place frequented by birds