Another Garden Good Guy
but I don't find these very friendly!
But they prey only on caterpillars.
From this site:
Potter Wasp, common name
for a group of caterpillar-hunting wasps
known for the pot-shaped mud nests built by some species.
Potter wasps are also known as mason wasps.
The potter wasp larva consumes from 1 to 12 caterpillars as it grows.