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Egg Laying & Incubation

Location

Montana, USA

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.

Male Mountain bluebird sitting on a stump
Links to Other Organizations

Education, conservation, data collection

Male Mountain Bluebird sitting on fence post

All photos on this website were taken and supplied by Mountain Bluebird Trails members.

  • North American Bluebird Society logo

nabluebirdsociety.org - North American Bluebird Society (NABS) - Mountain Bluebird Trails is an affiliate of NABS

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Sialis.org - General and Eastern Bluebird Information

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​https://nestwatch.org/ - A nationwide nest-monitoring program from Cornell Lab.

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