Goldfinches are one of the last birds to nest and raise young each summer. Their nest are made from dried grasses and and the soft fluff that thistle seeds are carried on the wind with. Another reason that Goldfinches breed later is that they feed on seeds, even as chicks. Seeds are much more plentiful later in the season. I have a number of sunflowers growing in my garden that I noticed seeds had been eaten from. So, we kept an eye out hoping to catch them in the act. Success! Remember to 'Share' and spread the love of nature!