Well, not to us but most definitely to the 'Ancient Americans' who used them as ornaments. And, even if you don't want to read the whole article, do check out the WONDERFUL tapestry made with Blue and Gold feathers - all these years after [it dates from 600-900 AD!] and it's still a vivid yellow and blue!
https://www.forbes.com/sites/grrlscient ... 3186be446f