Sentence:  It was the Spanish rooster, the bird that produced <WSD>coq</WSD> feathers, that sacrificed the most plumage. <WSD>Coqs</WSD>, the rooster's long, curved, and iridescent tail feathers, were plucked from the bird to trim hats or, in this case, masks. 
Meaning of the word marked with <WSD> tags:  A trimming of cock feathers on a woman's hat.