A sweat bee collects pollen from a purple coneflower in Raymond Park in Lewiston Tuesday morning. There are about 1,000 species in the United States, Canada and Central America. Their attraction to sweat makes them a nuisance, as they will sting if squeezed or squashed against one’s flesh. Nests are most often found in cavities in weeds or shrubs, or in the ground. They are gregarious and nest in groups.