Cardinals built a nest in the spokes of the umbrella on my deck in Charlotte NC. 3 eggs were in nest yesterday; 4 today. What can I do to help protect and nuture the baby birds when they hatch?? Deck umbrella is in the center of a wrought iron table. Deck is on second story of house. What kind of food should I make available? Anything else I should do, besides close the deck gate to keep people and dogs off the deck?