Sweat Bees of the Family, Halictidae are common in North America. They derive their name from salt collection behavior, landing on people and drinking salty sweat from the skin. However, their primary food is pollen. Bees evolved from predatory wasps over 100 million years ago as the flowering plants diversified. Bees collect pollen and provision nests, which for Halictid bees are usually in the ground. Sweat bees have a variety of social structures from solitary nesting to social nesting, depending on the species.
Several species of Halictid bees have shiny green metallic coloration. This coloration is a warning to predators that they can sting and the predator would be wise to hunt less dangerous prey. Sweat bee stings are low on the pain scale of insect stings. However, sweat bee stings can be an issue for people with insect venom allergies.