Pine Siskins on Seedheads

I've been very glad I left our purple coneflower seedheads uncut for proverbial "winter interest" this year. Not only have they provided a welcome visual variation from the snow-covered ground, but birds that like narrow seeds, including the goldfinch and the pine siskin (the bird shown below), have taken advantage of them from time to time throughout the winter, even though only a few feet away there is a mesh sock-style feeder full of Nyger thistle seed that's surely easier to cling to than these swaying stems.