Small nest

While I was out in the field this afternoon, I ran into this tiny nest.
No one was in it and there were no eggs inside (I think it was old) so I poked it for scale (don't mind the dirt on my hands -- I was planting seedlings).
I don't know what kind of bird makes nests like this, but I would have to guess that this once belonged to a little mama hummingbird due to it's teensy size.