A really pretty nest photographed by Barry. Perhaps an American Goldfinch nest, as they use a lot of thistle down in the construction, and this looks like plant fluff of some sort, possibly thistle. Barry suggested it might be a mouse nest built in the bird's nest and gave this link: https://naturallycuriouswithmaryholland.wordpress.com/2016/11/14/winter-mouse-house-2/ It is certainly possible, but this one does not look quite like other bird's nests I've seen with mouse nests built within. (CH)