Bantam chicken breeds are, essentially, chickens that are significantly smaller than regular or large breed chickens. Some might call them miniature chickens.
Bantam chickens are usually about half the size of regular, large breed chickens. However, they can range up to 1/3 the size of a large breed chicken. So, if you get them, you will want to be cautious while introducing new chickens to the flock.
Bantam Chickens come in two variations.