Throwback Thursday #5: Unknown cards from 1947

I actually remembered Throwback Thursday on Thursday, imagine that.

Today I am going to take a different approach and post some cards I really don't know much about. I found these at my local vintage dealer, and, as a fan of birds and cards, I brought them home. I don't know what set they are from, or a checklist for the set, of course. I don't even know what company made them.

Any ID help would be appreciated.

They are the same length as a normal card, but not as wide. They are slightly larger than the old 1990s phone card inserts were. The corers are rounded.