Seed-ball ornaments (a gift from my Mom). The first few rounds were stolen by squirrels but these have survived to the delight to the myriad juncos inhabiting my backyard.
Some individuals are skilled enough to hang on and feed directly.
The typical pattern, though, is to knock a few seeds off, drop down and
pick the seeds up off the snow.
Meanwhile, our resident song sparrow owns the seed ornament more stably hung in the pine tree.
And in the front windowfeeder, some goldfinch-house sparrow tension.