The following are observations that you can input during the fall retrieval of your NBN nesting sites.
Natural nest building material.Bees and wasps protect their nests with an extra thick capped end made of natural materials like mud, chewed leaves, grass, resin, sawdust, or plant fuzz.
Hibernation stages. If you chose to open a sample reed you will find that bees and wasps overwinter as an exposed larvae or within a cocoon. Springtime bees or wasps likely overwinter as adults, summertime bees or wasps likely overwinter as larvae. You may find uneaten bits of insects in wasp nesting chambers.
Nesting hole size.Bees and wasps come in a variety of sizes and each species has their own nesting hole size preference.