Chickens and other birds can lay eggs without being fertilised. These eggs are called unfertilised eggs. Unfertilised eggs cannot develop into chickens. Only fertilised eggs can develop into chickens.

Fertilised eggs are created when a sperm fertilises an egg. A rooster produces the sperm and a hen produces the egg. When a rooster and hen mate, the rooster's sperm fertilises the hen's egg. The fertilised egg then travels down the hen's oviduct and is laid in a shell.

Unfertilised eggs are laid when a hen ovulates but does not mate with a rooster. Ovulation is the process of releasing an egg from the ovary. Hens ovulate about once a day.

Unfertilised eggs are still nutritious and can be eaten. They are also used to make chicken products such as mayonnaise and egg nog.
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