Wild Birds Unlimited - East Lansing has a caged squirrel/blackbird proof suet feeder that limits the access to only small birds and birds that can feed upside down like woodpeckers, chickadees, nuthatches, and titmice.
The 1 inch-diameter cage keeps out squirrels and blackbirds. Springs hold the top down so squirrels can't lift it open while the smaller woodpeckers, as well as chickadees and nuthatches, can easily fit through the mesh to dine on the suet inside. It holds up to 2 suet cakes.
Or switch to pure beef suet with no seeds. The woodpeckers will eat straight suet but not the blackbirds.
- What birds eat suet? http://bit.ly/q2Sfje- Can I make my own suet? http://bit.ly/rsc1JT
- How do I Attract Woodpeckers? http://bit.ly/o4CLqI
- Filling Up on Fatty Foods: http://bit.ly/ob0NIq
- Can I feed suet year-round? http://bit.ly/I4Ow8l