A bird laying an egg is the most natural thing in the world.  Still, we humans always seem so surprised when it happens.

Egg production is not the result of mating, as many astonished single bird owners have discovered.  It is the breeding stimuli in the environment that causes a hen to generate an egg.  If you have only one bird, or are certain that your male and female are nothing more than good friends, the egg will be unviable.  Without fertilization, an egg will not produce a chick.  ...

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