Possible Clues:

• Natural nursery food preparation -- right to replace cold starter
• Crow colony
• Castle regularly ignored nearby dense slum area
• New Yorker putting duck in home for birds
• Breeding colony for birds and also for mammals such as penguins, seals and turtles
• Group of nesting birds in castle on European lines
• Castle nearly losing odd bits in overcrowded area
• Where birds breed round New Yorker circles
• Bird colony in castle by eastern railway
• Nesting place with nests