For the culinary use of chickens, see Chicken with apples and onions baked as food. Male and female chicken sitting together.

Chickens are one of the most common and widespread domestic animals, with a total population of 23. 7 billion as of 2018, up from more than 19 billion in 2011. In 2011 a study in genetic and archaeological evidence conclude that the origin of the modern-day chicken is from Southeast Asia. Dunghill fowl: a chicken with mixed parentage from different domestic varieties. Pullet: a young female chicken less than a year old. In the poultry industry, a pullet is a sexually immature chicken less than 22 weeks of age. In fact, chicken was originally a term only for an immature, or at least young, bird.