There are about 140–150 species in this family, known as sunbirds and spiderhunters. They are found mainly in Africa and Asia, with some species also found in Australia and other parts of Australasia.

They are small birds, generally 3–8 inches (7.6–20.3 cm) long. Most have long, thin, down-curved bills, brush-tipped tongues, medium to long tails and short legs.

Many species are brightly colored, often with feathers that have a shiny, metallic sheen. Males are usually more brightly colored than females.

Sunbirds live in forests, woodlands and scrublands. They feed mostly on nectar, but they also eat insects and other small animals. Some species also eat fruit. They are excellent fliers, and some can hover briefly like hummingbirds while feeding on flowers. Most, however, perch on a branch while feeding.