Celadon quail are domestic Coturnix quail selected for a genetic trait that causes hens to lay blue or blue-green eggs. Mature males and females usually weigh about 3–5 ounces, depending on line, with females often slightly heavier. Their body colors vary widely because celadon refers to egg color genetics rather than feather color; birds may be wild-type brown, white, tuxedo, silver, rosetta, or other domestic color patterns. Celadon quail are productive, small, fast-maturing birds raised for eggs, meat, and hobby breeding. They descend from Japanese/Coturnix quail lines that became common in U.S. aviculture and small-scale poultry production during the 20th century, with celadon breeding becoming more popular in recent decades.