Goldfinches and Cosmos seed

I can't get a good picture of them, but goldfinches are eating a lot of cosmos and sunflower seeds.  I am so thrilled that I am creating a food source for these wonderful little birds!  I didn't recognize them for a while, because bird book pictures of the breeding males show them so paunchy and bright yellow.  Many of my visitors are very slender, in shades of gray.  I finally figured out that they are juveniles and females.