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Archaeological evidence suggests that the bird commonly known as the chicken (Gallus domesticus) is a domesticated version of the Indian and Southeast Asian Red Jungle Fowl (Gallus gallus) which is still found in the wild today. It is thought that the bird was first tamed in China around 6000 BC, with the birds moving into India by 2000 B.C. The chicken then spread from China to Russia and from there into Europe between 750 B.C. – 42 A.D. Some scholars believe that the bird may have been domesticated first for its use in cockfighting, and only later used as a food source. The White Leghorn breed or crosses of this breed is the large white bird most commonly used in agriculture and for research, but there are over 400 different breeds of chickens. Chickens have a rigid social structure called the “pecking order” by which every bird establishes who is dominant and who is submissive in relationship to every other bird. Dominant birds peck at submissive birds, pluck their feathers, and may chase them away or steal their food. Submissive birds will not peck back and will usually run from the dominant birds. Anytime a bird is added or subtracted from the flock, even if it is only a well-known bird that has been temporarily removed and then returned to the group, the entire flock will fight briefly to re-establish the pecking order. Flocks of greater than 15 birds can lead to excessive fighting and less productivity. Males should not be kept together as they will often fight each other and may even sexually abuse or kill the weaker birds.