Why do peacocks (or really peahens) find giant feather displays attractive? I think the answer is usually actually "because it is indicative of a healthy mate"

Why do peacocks (or really peahens) find giant feather displays attractive? I think the answer is usually actually "because it is indicative of a healthy mate". If you need to be well fed and healthy to grow tall, or to maintain a giant set of ridiculous feathers, then it will probably be an attractive trait a few generations later, since it will predict success.