Turquoise-browed motmot
The turquoise-browed motmot (Eumomota superciliosa) is a colorful, medium-sized bird in the motmot family, Momotidae, measuring approximately 34 cm in length with an average mass of 66.5 g.[1] It is the national bird of El Salvador (known as torogoz) and Nicaragua (known as guardabarranco).[1] It features striking plumage, including a turquoise brow stripe, olive-green underparts, a cinnamon-rufous belly, a black facial mask, turquoise-blue flight feathers and tail, and distinctive racket-tipped tail feathers that are longer in males.[2][1] Native to Central America, it inhabits drier tropical lowlands from southeastern Mexico to northwestern Costa Rica, favoring semi-open areas such as dry forest edges, scrublands, gardens, and grazing pastures at elevations up to 1,400 m.[3][4][1] This species is monomorphic, with both sexes sharing similar coloration, though males are slightly larger; juveniles take about 25 days to develop adult plumage.[1] It is non-migratory and often conspicuous, perching on wires or branches in open areas, where it wags its tail to signal or deter predators.[3][1] Diurnally active and social, turquoise-browed motmots forage primarily on insects like caterpillars and beetles, as well as worms, spiders, small lizards, seeds, and fruit, using their serrated bill to capture prey.[1] Breeding occurs from March to May, with pairs or small colonies excavating burrows 100–244 cm long in earthen banks, rock crevices, or sandy riverbanks; notably, they nest colonially at cenotes and Maya ruins in the Yucatán Peninsula.[3][1] Females lay 3–4 eggs (rarely 5), which both parents incubate for about 17 days, with fledging occurring in 25 days to a month and shared parental care.[1] Seven subspecies are recognized, reflecting variation across its range on the Yucatán Peninsula and Pacific slope.[2] The turquoise-browed motmot has a large range of about 757,000 km² and an estimated population of 500,000–4,999,999 mature individuals, though numbers are suspected to be decreasing due to unspecified threats like habitat loss.[4] It is classified as Least Concern on the IUCN Red List, owing to its extensive distribution and stable overall status.[4][1]Taxonomy
Classification
The turquoise-browed motmot is classified within the domain Eukarya, kingdom Animalia, phylum Chordata, subphylum Vertebrata, class Aves, order Coraciiformes, family Momotidae, genus Eumomota, and species Eumomota superciliosa.[5][6] The binomial name Eumomota superciliosa was established following its original description as Pyronites superciliosus by H.R. Sandbach in 1837, based on specimens from Campeche, Mexico.[7] The monotypic genus Eumomota was subsequently erected by Philip Lutley Sclater in 1858 to accommodate this species, distinguishing it from other motmots through its unique turquoise brow and racketed tail morphology.[6][8] Taxonomic recognition as a distinct species has remained consistent since its description, with no significant revisions in the 20th or 21st centuries according to major ornithological authorities.[7][8] As the sole member of the genus Eumomota, the turquoise-browed motmot differs from congeners in the larger genus Momotus primarily in its prominent turquoise supercilium and more extensively blue tail rackets, features that underscore its isolated evolutionary position within the Momotidae.[8][6]Subspecies
The turquoise-browed motmot (Eumomota superciliosa) is divided into seven recognized subspecies, differentiated mainly by subtle variations in plumage tone, underpart coloration, tail racket size, and overall body dimensions, alongside their allopatric distributions across Central America. These distinctions arise from geographic isolation and were first systematically described in 20th-century ornithological research, including works by Ludlow Griscom and others that examined museum specimens and field observations.[2] The subspecies reflect clinal variation in plumage darkness and vibrancy, with northern populations generally showing brighter or more contrasting colors, while southern ones tend toward paler or smaller forms.- E. s. superciliosa (nominate): Occurs in southeastern Mexico, including Campeche and the northern Yucatán Peninsula; noted for the brightest turquoise brow stripe, enhancing its distinctive facial mask.[2][9]
- E. s. bipartita: Inhabits the Pacific slope of southern Mexico (Oaxaca, Chiapas) and Guatemala; features slightly duller overall plumage, with a darker greenish-olive breast sharply demarcated from cinnamon-rufous flanks and belly.[2][9]
- E. s. vanrossemi: Found in the interior highlands of Guatemala; represents an intermediate form in size and plumage tone between superciliosa and sylvestris, with balanced coloration and moderate body proportions.[2][9]
- E. s. sylvestris: Distributed in the Caribbean lowlands of Guatemala; similar to bipartita but with greener underparts, providing a more uniform olive tone ventrally.[2][9]
- E. s. apiaster: Ranges from El Salvador through western and southern Honduras to northwestern Nicaragua; resembles sylvestris in underpart coloration but distinguished by larger tail rackets, which are more pronounced in both sexes.[2][9]
- E. s. euroaustris: Confined to the Caribbean lowlands of northern Honduras; characterized by a paler belly compared to adjacent subspecies, with reduced rufous intensity.[2][9]
- E. s. australis: Occupies the Pacific lowlands of southwestern Nicaragua and northwestern Costa Rica; the smallest subspecies overall, with proportionally shorter body and tail measurements.[2][9]