Mayan Antthrush Formicarius moniliger


Justification of Red List Category
This species has a very large range, and hence does not approach the thresholds for Vulnerable under the range size criterion (Extent of Occurrence <20,000 km2 combined with a declining or fluctuating range size, habitat extent/quality, or population size and a small number of locations or severe fragmentation). Despite the fact that the population trend appears to be decreasing, the decline is not believed to be sufficiently rapid to approach the thresholds for Vulnerable under the population trend criterion (>30% decline over ten years or three generations). The population size is extremely large, and hence does not approach the thresholds for Vulnerable under the population size criterion (<10,000 mature individuals with a continuing decline estimated to be >10% in ten years or three generations, or with a specified population structure). For these reasons the species is evaluated as Least Concern.

Population justification
Partners in Flight estimate the total population to number 5,000,000-50,000,000 individuals (A. Panjabi in litt. 2008).

Trend justification
This species is suspected to lose 15.3-16.6% of suitable habitat within its distribution over three generations (10 years) based on a model of Amazonian deforestation (Soares-Filho et al. 2006, Bird et al. 2011). It is therefore suspected to decline by <25% over three generations.

Distribution and population

Race F. m. moniliger occurs along the Caribbean slope from southern Mexico (south from central Veraguas) east to Guatemala (except Petén). F. m. pallidus occurs on the Yucatan Peninsula (in south eastern Yucatan, Campeche and Quintana Roo), Mexico and northern Guatemala (N Petén). F. m. intermedius occurs in eastern Guatemala (presumed), Belize and north western Honduras.


It inhabits the floor of humid evergreen and semi-deciduous forest and second growth, preferring well-shaded but fairly open understorey rather than dense brush. Lowlands to 1800 m, possibly to 2050 m. In eastern Honduras, occurs at higher elevations than F. analis.


Text account compilers
Butchart, S., Derhé, M. & Ekstrom, J.

Recommended citation
BirdLife International (2022) Species factsheet: Formicarius moniliger. Downloaded from on 29/11/2022. Recommended citation for factsheets for more than one species: BirdLife International (2022) IUCN Red List for birds. Downloaded from on 29/11/2022.