When the purple coneflowers bloom, the goldfinches show up. They're cool that way.
The last couple of days I've been wondering when they'd appear. This morning when I finished my writing stint, I went out on the back porch to drink a cup of coffee and indulge in what I call thinking and my beloved family calls "there's mom, staring at the plants again"--and there they were, a male and female sitting on the coneflowers, eating the seeds. They also like sunflowers, milkweed, native thistles, and bee balm. They'll come to a feeder to eat nyger and sunflower seeds. A bird at a feeder is good, but a bird on a flower is excellent. It means the garden is bioregion-appropriate.
The males turn bright yellow during mating season. The females are a dull yellow year round and the males revert in October. They are fairly common and live in the Chicago area all year, but somehow I don't notice them until they make their flashy presence known in late June.
The Cornell Ornithology Lab Website All About Birds, where I got the photo, is a great place to learn more.