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Bluebirds/When are bluebird eggs are not viable?


Michigan Bluebird Society wrote at 2016-04-11 14:34:05
Eggs that are jarred, fall, are handled by a human, or are suddenly kicked by the brooding female due to disturbance may not be viable, as the sudden jerking can detach the inner white of the egg from the shell wall, causing failure. A growing embryo may suffer injury in the same way.  


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Bluebird Bob Walshaw


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