http://www.RollerFeeder.com/ On a windy blustery day, a female Cardinal is fending off house sparrows for a feeding place on the RollerFeeder. Cardinals are the largest bird size a RollerFeeder will accommodate. With larger birds such as blackbirds, the feeder is over 90% effective and eliminates problems with grackles, crows, morning doves and other larger feeder nuisance birds. Blackbird attempt http://www.youtube.com/watch?v=mokSWmy-yXI Morning dove attempt http://www.youtube.com/watch?v=jBWVJgmrw1I Preventing and controlling house english sparrows http://www.youtube.com/watch?v=bnNviPSe6Sg
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