I made a couple of these simple bird feeders for Christmas gifts.
Just a doughnut really, with a hole at the top for the hanger and one in the bottom for draining.
I left the inner ring area bare both so I could fire them flat (and probably stacked - I put this one around the center kiln post) and also so the birds have something to hold onto.
Its about 10" across and maybe 4" wide.
I did hang this one and fill it to see if the birds would actually use it and they sure did!
Its locally produced clay from Quyle Kilns, with a gold crystally glaze. Fired cone 10 reduction.