Tube bird feeder

1. A bird feeder comprising:

a seed tube having an open top and an open bottom, at least one seed access opening 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 mounted in said at least one seed access opening, said seed port structure comprising a frame member extending about said feed opening, an inner baffle wall extending inwardly of said seed tube, said inwardly extending baffle wall having a pair of protrusions thereon, an outer baffle wall extending exteriorly of said seed opening, said seed access opening being defined by a generally circular edge wall, a first pair of diametrically opposed recesses formed in said edge wall, said first pair of recesses being sized to permit said protrusions on said baffle wall to pass therethrough, a second set of recesses formed in said edge wall, said second set of recesses being diametrically opposed and being sized smaller than said first set of recesses; 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 set of recesses and rotating said seed port structure such that said pair of protrusions sit proximate said second set of recesses.

2. The bird feeder of claim 1 wherein said base portion includes first and second spring loaded elements extending outwardly from a side wall of said base portion, said spring loaded elements being biased outwardly, said seed tube having first and second apertures located near said bottom opening, each of said spring loaded elements engaging with one of said first and second apertures to hold said base portion in position.

3. The bird feeder of claim 1 wherein said removable seed port structure includes an integral perch.

4. The bird feeder of claim 1 wherein said first set of recesses are vertically aligned.

5. The bird feeder of claim 1 wherein said seed tube has a cylindrical configuration.

6. The bird feeder of claim 1 wherein said base has a U-shaped channel to receive said seed tube.

7. The bird feeder of claim 1 further including drainage openings in said base and ventilation openings in an upper portion of said bird feeder.

8. The bird feeder of claim 1 further including ventilation openings in said cover.