This feeder is designed to protect bluebirds and other small birds while feeding. Entrance holes on both sides allow the little ones in and keep starlings and other large birds out. Bluebirds and other small birds feed inside on berries, fruit, mealworms and insects. Red cup is included to hold the live mealworms or fruit. Front Plexiglas slides out for cleaning. Two pre-drilled holes on the top and bottom of the feeder lets you easily mount to a post or pole. Measures approximately 9' h x 11-1/2” w x 7-1/2” d. Made in Maine from eastern white pine.