A bird feeder comprising: a seed tube having an open top and an open bottom, at least one seed access opening (14, 16) in a side wall of said seed tube; a cover fitting on top of said seed tube to cover said open top; a base portion removably secured to said side wall and covering said open bottom; a removable seed port structure provided with an integral perch mounted in said at least one seed access opening (14, 16), wherein said seed port structure comprises a frame member extending about said feed opening, an inner baffle wall extending inwardly of said seed tube, characterized in that said inwardly extending baffle wall has a pair of protrusions thereon, said seed port structure further comprises an outer baffle wall extending exteriorly of said seed opening (14, 16), said at least one seed access opening (14, 16) is defined by a generally circular edge wall, a first pair of diametrically opposed recesses (18, 20) formed in said edge wall, said first pair of recesses (18, 20) being sized to permit said protrusions on said baffle wall to pass therethrough, a second pair of recesses (22, 24) formed in said edge wall, said second pair of recesses (22, 24) being diametrically opposed, said second pair of recesses (22, 24) being sized smaller than said first set of recesses (18, 20); and the arrangement being such that said seed port structure can be secured to said seed tube by passing said pair of protrusions through said first pair of recesses (18, 20) and rotating said seed port structure such that said pair of protrusions rest in a position adjacent to said second pair of recesses (22, 24). a seed tube having an open top and an open bottom, at least one seed access opening (14, 16) in a side wall of said seed tube; a cover fitting on top of said seed tube to cover said open top; a base portion removably secured to said side wall and covering said open bottom; a removable seed port structure provided with an integral perch mounted in said at least one seed access opening (14, 16), wherein said seed port structure comprises a frame member extending about said feed opening, an inner baffle wall extending inwardly of said seed tube, characterized in that said inwardly extending baffle wall has a pair of protrusions thereon, said seed port structure further comprises an outer baffle wall extending exteriorly of said seed opening (14, 16), said at least one seed access opening (14, 16) is defined by a generally circular edge wall, a first pair of diametrically opposed recesses (18, 20) formed in said edge wall, said first pair of recesses (18, 20) being sized to permit said protrusions on said baffle wall to pass therethrough, a second pair of recesses (22, 24) formed in said edge wall, said second pair of recesses (22, 24) being diametrically opposed, said second pair of recesses (22, 24) being sized smaller than said first set of recesses (18, 20); and the arrangement being such that said seed port structure can be secured to said seed tube by passing said pair of protrusions through said first pair of recesses (18, 20) and rotating said seed port structure such that said pair of protrusions rest in a position adjacent to said second pair of recesses (22, 24).