On Monday I said...

A friend writes: “When I sat down on the red bench by the door to Lee Memorial Library, I saw this nest above it.” It apparently is some sort of bee/wasp/hornet/ yellowjacket nest. What is it? And should it be left alone or what? 

A big thanks to Jim Molzan for IDing the nest. It is the nest of a mud wasp, a.k.a. a mud dauber wasp. 

The wasps are benfefcial are harmless if keft alone.

More on mud dauber wasps here:

https://yardandgarden.extension.iastate.edu/encyclopedia/mud-dauber-wasp