Bird egg

A bird egg is the reproductive structure produced by female birds, consisting of a hard, calcareous shell that encloses nutrient-dense yolk, protective albumen, and embryonic membranes, providing a self-contained environment for embryonic development and hatching. Bird eggs range in quantity from one to up to seventeen. Clutch size may vary latitudinally within a species.

Some birds lay eggs even when the eggs have not been fertilized; it is not uncommon for pet owners to find their lone bird nesting on a clutch of infertile eggs, which are sometimes called wind-eggs.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 4.0

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