| 摘要 |
A bird feeder comprising a seed container, 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 proximate the opening, a center tube 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 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.
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