| 摘要 |
A bird feeder having a feed reservoir provided with a feed access opening, a perch, a roof for covering the reservoir, a roof extension hingedly mounted on the roof and biased to normally extend in a coplanar relationship therewith, so as to overlie the access opening and an auxiliary perch fixed to depend from the roof extension, wherein the roof extension is movable to cover the access opening and the auxiliary perch is moved into a position below the perch in response to the application to the auxiliary perch of the weight of an animal or bird above a desired weight.
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