The antbirds (Thamnophilidae) are a large family of passerine birds found across subtropical and tropical Central and South America, from Mexico to Argentina. There are 212 species, known variously as antshrikes, antwrens, antvireos, fire-eyes, bare-eyes and bushbirds.

Most species live in forests, although a few are found in other habitats. Insects and other arthropods form the most important part of their diet, although small vertebrates are occasionally taken. Most species feed in the understory and midstory of the forest, although a few feed in the canopy and a few on the ground. Many join mixed-species feeding flocks, and a few species are core members.

To various degrees, around eighteen species specialise in following columns of army ants to eat the small invertebrates flushed by the ants, and many others may feed in this way opportunistically. Because army ants are unpredictable in their movements, it is impractical for obligate ant-followers to maintain a territory that always contains swarms to feed around. Antbirds have evolved a more complicated system than the strict territoriality of most other birds. They generally maintain breeding territories but travel outside those territories in order to feed at swarms. Several pairs of the same species may attend a swarm, with the dominant pair at the swarm being the pair which holds the territory that the swarm is in. In addition to competition within species, competition among species exists, and larger species are dominant. At a swarm, the dominant species occupies positions above the central front of the swarm, which yields the largest amount of prey. Smaller, less dominant species locate themselves further away from the centre, or higher above the location of the dominant species, where prey is less plentiful.