Covert feather
A covert feather or tectrix on a bird is one of a set of feathers, called coverts, which cover other feathers. The coverts help to smooth airflow over the wings and tail.Ear coverts
The ear coverts are small feathers behind the bird's eye which cover the ear opening.Tail coverts
The uppertail and undertail coverts cover the base of the tail feathers above and below. Sometimes these coverts are more specialised. The "tail" of a peacock is made of modified elongated uppertail coverts called a "train".The upperwing coverts fall into two groups: those on the inner wing, which overlay the secondary flight feathers, known as the secondary coverts, and those on the outer wing, which overlay the primary flight feathers, the primary coverts. Within each group, the feathers form a number of rows. The feathers of the outermost, largest, row are termed greater coverts; those in the next row are the median coverts, and any remaining rows are termed lesser coverts. The underwing has corresponding sets of coverts. In addition, the front edge of the wing is covered with a group of feathers called the marginal coverts. Within each group of wing coverts, the rows of feathers overlap each other like roof tiles.