A bird feeder is provided having a seed reservoir with a side wall that has at least one seed access opening and an adjustable feed port assembly. The feed port assembly includes a base mounted to the side wall in a fixed relationship thereto and having a central opening in communication with the seed in the reservoir. Fitted to the base is a rotatable insert having a perch coupled thereto in fixed relationship so that the perch and insert rotate as a unit. The insert is rotatable between two positions, an upright position in which the perch is below the base central opening enabling birds to feed while standing on the perch, and an upside down position in which the perch is above the base central opening, requiring birds to hang upside down from the perch to feed.