... and this time, I got a good enough look in decent lighting to make an identification: Carolina wren. They eat insects and fruit, so I can see why the suet cake would be so appealing. We have a ton of wrens in our yard; I don't know why it's taken so long for any of them to discover the suet. I put it out every winter.
These dolls are black girls who speak heritage languages -- several apiece. Cool. Also most of them have conspicuously ethnic hair.