Sweat bees are small bees usually about 1/4- to 1/2-inch long (0.6-1.3 cm). Their common name refers to the fact that they are attracted to the salt in human sweat.
In the United States, they are usually brown, black, red, or metallic green. They are the most common type of bee in the whole northern hemisphere and are considered excellent pollinators.
It is estimated that about 1000 different species reside in North and Central America. Halictidae, the family name of sweat bees, comes from hals, the Greek word for salt.