A Texas farmer had a remarkable discovery when he found a huge egg laid by an average-sized chicken. This egg wass no ordinary egg; it was a double egg, a rare occurrence in the world of poultry.
Double-shelled eggs are extremely rare and often doubted by many, but they occur when an egg that is almost ready to be laid reverses direction and gets a new layer of albumen covered by a second shell. This phenomenon is known as a ‘counter-peristalsis contraction.’