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Egg Laying & Incubation
The female bluebird will lay one egg per day, usually in the morning, until she has laid a clutch of 4-6 eggs. The eggs are about an inch long and light blue in color, although occasionally, the female can't produce blue pigment and the eggs will be white. She will start incubating once all the eggs are laid. This way, all the eggs will hatch at approximately the same time. It's called, "synchronous hatching". The female will turn the eggs on a regular basis to ensure normal development.