Goldfinch Date

I saw goldfinches gathering nesting material today. At distance, their coloring really blended in with the dull yellow of the vegetation. You would think the males would pop out more. This female appeared to be supervising the male's gathering.

But perhaps she was just begging for a kiss? He didn't give her any nesting material, he actually dropped what he had to bill tap with her. She had started coming towards him, wings slightly fluttering, giving a soft call and then they had a quick bill peck. No copulation occurred, but I'm sure it was some sort of pair bonding.

She flew away, and he continued to gather the soft thistle down. I wonder what goldfinches used for nesting material before thistle was introduced to North America?