Tail coverts are the wide feathers covering the base of that Wyandotte's main tail feathers. Can you see the stiff tail feathers with those colored feathers covering the bases? Good heavy , wide feather quality is important, especially in hens. They will have far less "rooster damage" if their back and tail feathers are wide and thick.Now look at the black's tail, and you will see much narrower feathers that look rumpled as they are lacking substance. Because of this you see a dip in front of her tail.Could you explain "tail coverts" please?