Chickens that lay green eggs include several breeds and hybrids, primarily those carrying the blue egg gene combined with brown egg layers. The main types are:

• Araucana : A well-known breed from South America that lays blue to green eggs. They have distinctive feather tufts and lay about 250 eggs per year

• Easter Eggers : Hybrid chickens carrying the blue egg gene, laying eggs in various colors including blue and green. They are friendly, hardy, and good foragers but do not breed true for egg color

• Olive Eggers : Crosses between blue egg layers (like Araucanas or Ameraucanas) and brown egg layers (such as Marans). They lay olive-green eggs and are reliable layers, producing around 200–280 eggs annually. They tend to be calm and good for families

• Isbar (Silverudd’s Blue) : A Swedish breed that lays light green eggs, usually in a mossy shade. They are moderate layers (150–200 eggs/year) and have a calm temperament

• Green Queen : A hybrid breed that lays various shades of green eggs, from mint to deep olive. They lay about 150–275 eggs per year and are friendly and easy to handle

Other notable green egg layers include specialty hybrids like the "Production Green" layers bred by crossing high-producing brown egg hens with blue egg gene carriers to produce high volumes of green eggs

. In summary, green eggs are laid mostly by hybrids combining blue and brown egg-laying breeds, with Araucanas and Olive Eggers being the most recognized green egg layers. The green color results from the blue eggshell pigment overlaying brown pigmentation, producing the green hue