Our eggs are NON-GMO. Our hens produce eggs a variety of colors and sizes from the typical brown and white to varying shads of blue, green and olive. Yolk color changes with the seasons. During the winter the yolks will become more yellow in color while in the spring, summer and fall the yolks range in color from yellow to bright orange. The color of the yolk is a direct connection to what that chicken eats. The more b-carotene they eat the more orange their yolks will be. B-carotene is found in leafy greens, pumpkins and fruits. The eggs range in size from the occasional medium to 30% larger than Jumbo! Young chickens lay smaller eggs at first. Our eggs are ungraded and your dozen will include a variety of both sizes and colors.