Here's an American Goldfinch, his beak open as he reaches for a seed.
If you look carefully, you can see the seed in his beak.
One seed isn't anywhere close to enough, so he goes back for another and another and another.
I'm always amazed by how persistent the birds are. They'll stay on a single plant for up to an hour, devouring the seeds. It's particularly fun to watch them when they turn upside down to pluck a seed from the flower.
Here's what the plant looks like when they're finally finished. Not much left for the next bird.
I won't tell you how many hours I've spent watching goldfinches and other birds feasting, but each time I see them, I'm grateful for the volunteer sunflower that decided to grow so close to my house.