Halictida

The Halictida is a family of bees that are found on every continent except Antarctica.
They are most abundant in temperate regions, but also occur in tropical climates.
They usually nest in the ground, often in habitats like clay soil and river banks.
Some species also nest in wood.
They are very diverse in appearance, ranging from metallic green, blue, and purple to brownish or black.
They have short tongues and curved basal wing veins.
Some species are solitary, some are communal, some are semi-social, and some are eusocial.
They are also known as sweat bees, because they are often attracted to human perspiration.
They are important pollinators of many plants.