Offer Live Mealworms or other Bluebird Food The feeder has entry holes on two ends that allow the bluebirds to feed inside. The entry holes prevent larger more aggressive birds, like starlings & jays, from feeding. Directions are included on how to use this feeder. Chickadees, nuthatches, and wrens will also feed here. The Hanging Bluebird Feeder can also be bottom mounted. Feeder Dimensions: 7” wide x 11” long x 8” tall.