Pigeon egg on my balcony is not being warmed up enough. Help.?

A pigeon built a nest on my balcony and laid an egg two days ago. It sat on the egg during the day but I just noticed that the pigeon is gone and it is night time. I've read that the male and the female pigeon are supposed to take shifts warming up the egg but they're not doing it. I'm afraid it will... show more A pigeon built a nest on my balcony and laid an egg two days ago. It sat on the egg during the day but I just noticed that the pigeon is gone and it is night time. I've read that the male and the female pigeon are supposed to take shifts warming up the egg but they're not doing it. I'm afraid it will grow cold and die. What should I do?
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