Eaglets DN17 and DN18 have grey fuzzy thermal down. It's more waterproof than their white fuzzy natal down, but doesn't zip together like feathers: a down coat, not a rain jacket. On a rainy, windy day at Decorah North, they did their best to get out of the rain beneath Mombrella's soggy feathers.

What are feathers? What is molt? More here: https://www.raptorresource.org/2024/0....