Bird feeder
Published • May 19, 1992
Authors:
LOKEN SELMER M
Abstract
A tube-shaped bird feeder with a tiltable perch which allows a person to control the maximum weight of a bird which can feed on the feeder by adjusting the counterweight attached to a tiltable perch. When a heavier bird alights on the perch, the perch swings down out of the way without closing the f...
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