Songbird Essentials - Post Mount Bluebird Feeder Post Mount Bluebird Feeder. Bluebirds soon learn to reach inside this feeder for the meal worms and treats you provide. Designed for easy three step training. 1) Leave the lid open & remove polycarbonate clear plastic side. 2) Insert polycarbonate clear plastic side. 3) Close the lid so only bluebirds can use the feeder. Mount on a post or tree.There is one pre-drilled hole in the top of the feeder for tree mount. Any other mount option will have to be added/altered by the customer. Hardware not included.