A rooster is a male chicken. The scientific name for rooster is Gallus Domesticus. It has a striking appearance and can be easily differentiated from a hen by its striking, colorful plumage. The tail is long and flowing and there are bright pointed feathers on their necks. It is bigger in size than the hen and his large comb on top of his head is simply unique. It is the specialty of roosters that makes it so attractive.