Antbird
Passerine birds of the Neotropics, known for ant-following and diverse forms.
The antbirds are a large passerine bird family, Thamnophilidae, found across subtropical and tropical Central and South America, from Mexico to Argentina. Despite common names, they are not closely related to wrens, vireos, or shrikes.
- Family
- Thamnophilidae
- Range
- Subtropical and tropical Central and South America, from Mexico to Argentina
- Diet
- Primarily insects and other arthropods; occasionally small vertebrates
- Conservation status
- 38 species threatened with extinction due to habitat loss
- Distinctive feature
- Sexually dimorphic plumage; many have white feather patches on back or shoulders used for communication
Lore & Background
Antbirds are generally small birds with rounded wings and strong legs, and mostly sombre grey, white, brown, and rufous plumage that is sexually dimorphic. Most have heavy bills, often hooked at the tip, with a notch for holding insect prey. Some species communicate warnings by exposing white feather patches on their backs or shoulders. Most species live in forests, feeding in the understory and midstory, though a few feed in the canopy or on the ground. Around eighteen species specialise in following swarms of army ants to eat flushed invertebrates, and many others feed opportunistically in this way. Antbirds are monogamous, mate for life, and defend territories. They usually lay two eggs in a nest suspended from branches or supported on a branch, stump, or mound on the ground. Both parents share incubation and brooding, and after fledging each parent cares exclusively for one chick. The family is one of the suboscines, with simpler syrinxes than other songbirds, yet their songs are distinctive and species-specific, allowing field identification by ear. Most species have at least two call types: the loudsong, often used for territorial purposes, and the softsong, possibly related to pair-bond maintenance.
Reader's Guide
The antbird family Thamnophilidae was formerly considered a subfamily within Formicariidae, but was removed due to differences in the sternum and syrinx, and supported by DNA–DNA hybridization studies. They are now placed in the infraorder Tyrannides, occupying a fairly basal position, with gnateaters as their sister group. Two major clades exist: most antshrikes and larger strong-billed species, versus classical antwrens and more slender long-billed species. Some genera, particularly in Myrmotherula and Myrmeciza, need reassignment. Thirty-eight species are threatened with extinction due to human activities, primarily habitat loss leading to fragmentation and increased nest predation. Antbirds are not targeted by hunters or the pet trade. Their significance lies in their ecological roles as insectivores and ant-followers, and as a diverse model for studying evolution, behavior, and conservation in Neotropical forests.
Did You Know?
- Antbirds are not closely related to wrens, vireos, or shrikes, despite common names like antwren, antvireo, and antshrike.
- Around eighteen species specialise in following army ant swarms to eat flushed invertebrates.
- Both parents share incubation and brooding, and after fledging each parent cares exclusively for one chick.
- The sister group of the Thamnophilidae is thought to be the gnateaters.
Frequently Asked Questions
What exactly is an antbird?
Antbirds are a diverse group of small Neotropical songbirds in the family Thamnophilidae, found in subtropical and tropical forests stretching from Mexico all the way down to Argentina. They form their own distinct passerine lineage rather than belonging to any other familiar bird family.
What do antbirds eat and how do they hunt?
Their diet is overwhelmingly made up of insects and other arthropods, though they will occasionally pick off small vertebrates. They are well known for trailing army-ant swarms through the understory, snatching up prey that gets flushed out of leaf litter and low vegetation.
What makes antbird plumage so distinctive?
Many antbird species show striking sexual dimorphism, with males and females looking quite different from one another. A hallmark trait across the family is the flash of white patches on the back or shoulders, which they display as a visual signal to other birds.
Are antbirds endangered?
Habitat loss has pushed 38 antbird species onto threatened lists, making them one of the more vulnerable bird families in the Neotropics. Ongoing deforestation and land conversion across their Central and South American range remain the primary pressure on their populations.
Are antbirds related to wrens, vireos, or shrikes?
No—despite some overlapping common names, antbirds are not close relatives of any of those groups. They occupy their own evolutionary branch as the family Thamnophilidae, a lineage unique to the Neotropical region.
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