A bird feeder (10) comprising a seed container (32), a seed tray situated below the seed container, a shroud extending about the seed tray and having an opening therein to permit access thereto, a perch (136) proximate the opening, a center tube (44) mounted internally of the feed container and a non rotatable nut mounted within the center tube, a post being screwthreadedly engaged with the non rotatable nut to adjust spring tension, a cover (12) about an upper end of the feed container, the arrangement being such that pressure from an animal such as a squirrel on either the cover or perch will cause the shroud to block the opening and deny access to the seed.
