These females, downy woodpecker and grosbeak seen to get along fine sharing a feeder.
The male red winged blackbird doesn’t seem to tolerate anyone sharing a feeder but the female seems OK with it – I’ll try to get some pictures for that soon.
It would be interesting to know how this kind of sharing varies between species and sex.
I’m going to be watching out for more examples. Does anyone know of an existing set of observations?