Our feeder seed is a good general purpose food formulated specifically for clinging bird species and primarily for use in tubular seed feeders. It is an economical food to start feeding your garden birds. This mix is free flowing in nature which prevents clogging. For: bird. For: blue tit, chaffinch, goldfinch, great tit, greenfinch, house sparrow, siskin, tree sparrow. For: bird tables, feeder houses, tube feeders.