Many wild bees are easily overlooked. They are very small, very fast, or both.
Here are some close-ups of bees that fly below most people's radar.
(Bee IDs have been edited....)
All bees pictured below are in the genus Lasioglossum, the tiny "sweat bees." Some are only a few millimeters long!
(For scale, above: the white flowers are apache plume; the yellow is curlycup gumweed.)
BONUS... Lasioglossum nest site photos!
The nest entrances (perfectly round circles) are tiny. About the size of a bee's head.
These tiny bees are common in urban areas, just rarely noticed.