It is normal for the female to leave the egg(s) at this early stage. She may be away for a couple of hours. She will cover the clutch during rain showers (or if it gets too hot!). Should a crow be foolish enough to get too close there will be a swift return to safeguard her eggs.
Eggs are laid at 2 to 3 day intervals. In fact it can be as accurate as every 57 hours.
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