How are eggs of different shapes made, and why are they the shape they are? Why do some eggs contain two yolks? How are the colours and patterns of an eggshell created, and why do they vary? And which end of an egg is laid first? Firmly grounded in science and enriched by a wealth of observation drawn from a lifetime spent studying birds, this is an illuminating and engaging exploration of the science behind eggs and the history of man's obsession with them.