Ever seen a mob of tiny sweat bees?

The bees below, from the genus Lasioglossum  (as identified by native pollinator specialist Robbin Thorp, distinguished emeritus professor of entomology at the University of California, Davis), just about flash-mobbed an Iceland poppy.

These hungry little bees were a sight to see.

The genus, the largest of all bee genera, contains more than 1700 species in numerous subgenera worldwide, according to Wikipedia. "They are highly variable in size, coloration, and sculpture; among the more unusual variants, some are cleptoparasites, some are nocturnal, and some are oligolectic. Most Lasioglossum nest in the ground, but some species nest in rotten logs."

Why are they called "sweat bees?" Not an attractive name, is it? Well, they're called sweat bees because they're attracted to the salt in human sweat.