http://www.RollerFeeder.com/ In addition to being squirrel proof, RollerFeeder is over 90% effective against smaller blackbirds (red winged blackbirds, other blackbirds, also starlings). It is near 100% effective against larger nuisance birds like cowbirds and grackles, and 100% completely eliminates bird feeder problems from crows, pigeons, morning doves and other medium large or larger nuisance birds that disrupt bird feeders. See how it prevents a morning dove here http://www.youtube.com/watch?v=jBWVJgmrw1I
What bird sizes does a RollerFeeder allow for: Chickadee up to and including Cardinal size birds. Also Woodpecker varieties such as Downy, Hairy, and Red Bellied woodpeckers.
Established in 1998, Rollerfeeder is made in USA
