After all the eggs are laid, the female begins to incubate them. At night she stays on top of them constantly, and may leave them for 30-45 minutes at a time during the day.
When an egg hatches, the chick begins chipping away in a straight line at the largest diameter of the egg. In this video, we can see the progress of the first egg hatching. It's a relatively slow process; to show it we've sped up the video in certain parts. As the chick emerges from the shell, the mom stays on the nest to provide heat.
(Don't adjust your volume. This clip has no audio.)
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