Green sweat bee nest

Agapostemon (green sweat bees) nest in the ground. They live in small social groups. 

Ground nests often have several entrance holes; each must be guarded. This is a "job" for certain bees. Check out the two guard bees standing sentry. I consider myself very lucky they tolerated my presence here. Enjoy!

Aren't they beautiful?

This particular nest has two main entrances, pictured above. There is also a back door:

Thanks to the horticulture team at Red Butte Garden for this wonderful discovery!