Mate Choice, Sexual Selection, and Intersexual Selection.
The male has the brightest feathers, as they like to show off to females.
No, they naturally molt their tail feathers following the breeding season
Their feathers are brightest just after the spring moult.
Only one set of feathers are grown at a time, so no feathers/plumage can be obscurred by any others. Breeding feathers are also generally considered the primary/most important, so would never be considered to obscure less important plumage. You may mean eclipse, or non-breeding plumage, which is effectively the complete opposite case as in your question.
Long, showy feathers, acquired during the breeding season
sexual selection
I really depends on your animal. With peacocks, it's who has the brightest and fanciest feathers. With deer, it's who is the strongest. It just depends.
At what age do female mallards get their adult feathers?
feathers
The chicken may have died from picking. This happens when the hens are bored, overcrowded, or have lack of protein in their diet so they result to cannibalism, beginning with feather picking, or plucking the feathers from other chickens. Another reason is from breeding. A rooster may find a "favorite" hen and mate her continually, mounting on her back each time and wearing the feathers out.
Yes, mature Peacocks do lose some of their feathers. After about age three, they begin cycles of annual molting of their long tail feathers. This usually occurs in summer, around July or August. After each molting, the tail feathers will be longer and have more "eyes". They drop the feathers here and there around the grounds where they roam, making it easy to find and collect them if you are lucky enough to live with them.
Lord Haward meant that they were taking advantage of a situation by gradually exploiting or harming someone or something over time, similar to how plucking feathers off a bird would be done slowly and methodically. This could refer to slowly draining resources, exploiting vulnerabilities, or manipulating a situation for personal gain.