egg mortality

does it die if it's left un encubated over night?

Kraig I'm no expert but I think the temperature would be the telling factor.

If you are talking about an egg in a nest some birds will lay an egg every morning and just cover them over until the clutch is almost complete before starting to incubate. This ensures that all the eggs hatch at more or less the same time. If they have started to incubate and then the egg is left to go cold then it will die. Hope this helps.

Thanks for the info.