A squirrel resistant bird feeder which comprises a seed container, a seed tray mounted below the seed container, a shroud enclosing the seed container and seed tray with at least one feed opening in a lower portion of the shroud, a cover member extending over the shroud, a central tube extending between the seed tray and an upper portion of the seed container, a center post within the center tube, and a plunger comprising an upper plunger portion and a lower plunger portion, the upper plunger portion and lower portion being screwthreadedly engaged such that the length may be varied, a spring member mounted about the center post and biasing the seed tray and the lower plunger portion.