sorry, what does it mean by non breeding.Thankyou
Adults of a great many species of birds acquire breeding plumage also called alternate plumage just before the breeding season, and most hold this plumage for about half a year. Breeding plumage is usually more striking than nonbreeding plumage or basic plumage, especially in males. Most birds molt into their breeding plumage, but some species such as European Starling attain their beeding plumage appearance by a gradual wearing of feather edges from their autumn plumage.
Species in which males and females show different plumages for at least part of the year are said to be sexually dimorphic. In many such species, males in breeding plumage are more colorful or more strikingly patterned than females. Male ducks bear a bold or colorful plumage for most of the year and molt into a very plain plumage, called an eclipse plumage, for only a few weeks in summer. Males in eclipse plumage sometimes resemble females.