Pigeons will sometimes lay small eggs when it's the first time. Odd eggs can also happen if they lay too much/often. And also sometimes when they get old and near the end of their laying life they will often lay only one egg, or an odd sized/shaped egg.Cyril and Clara have an egg again - but it looks really small. Maybe it's not too small, but do pigeons ever have 'fairy eggs' like chickens do?