Glossary
Small, often metallic-colored bees in the family Halictidae that are attracted to human perspiration for its mineral salt content. Despite their name, sweat bees are important native pollinators that rarely sting and are commonly seen in Florida gardens and natural areas alongside honey bees.
Sweat bees are among the most common and least recognized bees in North America. Most are small (4 to 10mm, roughly the size of a grain of rice to a pencil eraser), and many sport stunning metallic coloration: iridescent green, blue, copper, or bronze. They belong to the family Halictidae, one of the six bee families found in the United States, and include approximately 500 species across the continent.
The name comes from their attraction to human perspiration, which provides mineral salts (sodium, potassium, magnesium) that are scarce in their plant-based diet. On a hot Florida day, you may feel a tiny tickle on your arm and discover a small metallic-green bee lapping at your sweat. This behavior is harmless, and sweat bees rarely sting unless pressed against the skin. When they do sting, the pain is minimal (rated 1.0 on the Schmidt Pain Index, the lowest category).
Sweat bees are generalist pollinators that visit a wide variety of flowers. Their small body size allows them to pollinate flowers that are too small for honey bees to enter efficiently. Studies have shown that sweat bees are among the top three most important pollinator groups for vegetable crops (tomatoes, peppers, squash, strawberries) in many agricultural regions. They pollinate a wider variety of native wildflowers than honey bees, which tend to focus on the most productive nectar sources.
Most sweat bees are ground-nesting, excavating small burrows in bare or sparsely vegetated soil. Some species are solitary (each female digs and provisions her own nest), while others are semi-social or primitively eusocial (primitive colonies with a queen and workers). Leaving patches of bare ground in gardens and avoiding widespread ground cover helps support these critical native pollinators.
They can, but rarely do. Sweat bees only sting when trapped against the skin (pressed by clothing or pinched). The sting is extremely mild, rated 1.0 on the Schmidt Pain Index (the lowest level), similar to a tiny pinprick. Most people barely notice it. No anti-bee behavior is needed for sweat bees.
Both are in the order Hymenoptera and the superfamily Apoidea, but they belong to different families: honey bees are in Apidae, sweat bees are in Halictidae. They share a common ancestor but diverged millions of years ago. Sweat bees do not produce honey, live in much smaller colonies (or are solitary), and have very different behavior.
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