How nice of it to decorate your garden with some whimsy. LOL! It is interesting. Maybe it was a good idea at the time for a nest.
HHG - I'm pretty sure a sort of bee or wasp has laid egg(s) in the tube and stoppered it up. The bamboo tube is less than 1/2" wide or so. I'll keep watch and see what hatches out. I'll keep ya posted.
I will be watching for this one!Never seen anything like that before. I did have house wrens that were determined to locate in the end of a rolled up bamboo shade. They finally gave up.
Thank you for visiting. I appreciate your notes, comments and questions and will try to reply to each one! :-)