The ovaries are made up of a number of egg tubes, called ovarioles, which vary in size and number by species.
2.
Such a scrap of tissue may stimulate the egg-producing glands to react as though it were a yolk and wrap it in albumen, membranes and a shell as it travels through the egg tube.
3.
These are brought into contact with the opening of the female's oviduct, or egg tube ( most female birds have only one that works ), and the sperm is released to fertilize the eggs.
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