Rufous-fronted greenlet

Rufous-fronted greenlet
Scientific classification Edit this classification
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Passeriformes
Family: Vireonidae
Genus: Tunchiornis
Species:
T. ferrugineifrons
Binomial name
Tunchiornis ferrugineifrons
(Sclater, 1862)

The rufous-fronted greenlet (Tunchiornis ferrugineifrons) is a passerine bird in the family Vireonidae, the vireos, greenlets, and shrike-babblers.[1] It is found in Bolivia, Brazil, Colombia, Ecuador, Peru, and Venezuela.[2]

Taxonomy and systematics

The rufous-fronted greenlet was formally described in 1862 by the English zoologist Philip Sclater as Hylophilus ferrugineifrons from a holotype collected in Bogota, Colombia.[3] It was subsequently reassigned as a subspecies of what was then the tawny-crowned greenlet (Pachysylvia ochraceiceps ).[4] By the end of the twentieth century the tawny-crowned greenlet had been reassigned to genus Hylophilus.[5] The new genus Tunchiornis was erected for the species in 2014.[6]

Based on a study published in 2021, in 2025 the Clements Checklist split the tawny-crowned greenlet into the rufous-fronted greenlet and three other species.[7][8] AviList also adopted the split in its initial 2025 version.[9] The IOC and the South American Classification Committee (SACC) followed suit in 2026.[1][10]

The rufous-fronted greenlet's further taxonomy is unsettled. BirdLife International's Handbook of the Birds of the World (HBW) did not adopt the four-way split but retained ferrugineifrons as a subspecies of T. ochraceiceps. It also uses the name "rufous-fronted greenlet" for T. rubrifrons, which the other systems call the Para greenlet.[11] And in July 2026 the South American Classification Committee renamed all members of Tunchiornis "brownlet". They made the change because the genus Tunchiornis is not closely related to the other genera of greenlets and because its species are more brown than green.[note 1][12][13]

The IOC, AviList, and Clements recognize two subspecies of rufous-fronted greenlet, the nominate T. f. ferrugineifrons (Sclater, PL, 1862) and T. f. viridior (Todd, WEC, 1929).[1][8][9]

Description

The ochre-crowned greenlet is 12 cm (4.7 in) long and weighs 9 to 14 g (0.32 to 0.49 oz). The sexes have the same plumage. Adults of the nominate subspecies T. o. ochraceiceps have a rufous forehead and crown. Their face is mostly whitish with an olivaceous wash. Their upperparts and wings are brownish olive and their tail more brown. Their throat is whitish and their underparts whitish with a strong olivaceous wash. Subspecies T. f. viridior has a slightly lighter rufous crown and a greener back and tail than the nominate. Both subspecies have a pale iris, a black maxilla, a paler gray mandible, and pinkish to grayish legs and feet.[14][15]

Distribution and habitat

The nominate subspecies of the rufous-fronted greenlet has the larger and more northerly range of the two. It is found from the southeastern quadrant of Colombia[16] south through eastern Ecuador into northeastern Peru. From that line its range continues east through southern Venezuela's Amazonas and southern Bolívar states[17] and northwestern Brazil's Acre and Amazonas states. In Brazil its range extends to the Negro River north of the Amazon and to the Madeira River south of it.[14] Some sources extend its range slightly into far western Guyana but the SACC has no records in that country.[1][9][2] Subspecies T. f. viridior is found from San Martín Department in northern Peru south into Bolivia to northern Santa Cruz Department.[14]

The rufous-fronted greenlet primarily inhabits the undergrowth of intact terra firme forest.[14] In elevation it ranges up to 800 m (2,600 ft) in Colombia, to 700 m (2,300 ft) in Ecuador, to 1,200 m (3,900 ft) in Peru, to 1,600 m (5,200 ft) in Venezuela, and to 800 m (2,600 ft) in Brazil.[16][18][19][17][15]

Behavior

Movement

The rufous-fronted greenlet is a year-round resident.[14]

Feeding

The rufous-fronted greenlet's diet has not been studied but is known to include insects, spiders, and smaller amounts of fruit. It typically forages as a member of a mixed-species feeding flock and takes most prey by gleaning from leaves.[14]

Breeding

The rufous-fronted greenlet's breeding season has not been fully defined but spans at least late August to early October in southern Peru. Three nests were open cups made mostly from moss lined with seed fluff and thin grass. They were in shrubs between 0.8 and 2.0 m (3 and 7 ft) above the ground. The only known clutches were of one or two eggs that were creamy white with dark brown spots. The incubation period is about 14 days and fledging occurs about 11 days after hatch. Both parents provision nestlings.[14]

Vocalization

The rufous-fronted greenlet's song is a "pure whistle that is steadily repeated many times at intervals of a few seconds" and that usually descends in pitch. Its call is a "short stereotypic chattered series of rapidly repeated rising nasal notes: nyaa-nya-nya-nya, typically uttered several times at irregular intervals".[14]

Status

The IUCN follows HBW taxonomy and so has not separately assessed the rufous-fronted greenlet from the combined ochre-crowned and rufous-fronted greenlets.[20] The rufous-fronted greenlet is considered "uncommon" in Colombia, "widespread and locally fairly common" in Peru, "fairly common" in Venezuela, and "frequent to uncommon" in Brazil.[16][19][17][15] "Information [is] needed, but it seems likely that large blocks of undisturbed forest are essential to its long-term survival."[14]

Notes

  1. ↑ The SACC adopted the split in February 2026 and between then and July called T. ferrugineifrons the "western tawny-crowned greenlet". At the same time that they adopted "brownlet" they deleted "tawny-crowned" and adopted the other systems' prefix of "rufous-fronted" for the species.

References

  1. 1 2 3 4 Gill, Frank; Donsker, David; Rasmussen, Pamela, eds. (April 2026). "IOC World Bird List". v 15.2. Retrieved April 26, 2026.
  2. 1 2 Remsen, J. V., Jr., J. I. Areta, E. Bonaccorso, S. Claramunt, D. F. Lane, L, N. Naka, M. B. Robbins, F. G. Stiles, and K. J. Zimmer. Version 25 July 2026. Species Lists of Birds for South American Countries and Territories. South American Classification Committee associated with the International Ornithologists' Union. https://www.museum.lsu.edu/~Remsen/SACCCountryLists.htm retrieved 25 July 2026
  3. ↑ Sclater, Philip Lutley (1862). "Characters of Nine New Species of Birds received in collections from Bogota". Proceedings of the Zoological Society of London (in Latin and English): 110.
  4. ↑ Todd, W. E. C. (1929). "A Review of the Vireonine Genus Pachysylvia". Proceedings of the Biological Society of Washington 42:181–205.
  5. ↑ Check-list of North American Birds (7th ed.). Washington, D.C.: American Ornithologists' Union. 1998. p. 439.
  6. ↑ Slager, David L.; Klicka, John (2014). "Polyphyly of Hylophilus and a new genus for the Tawny-crowned Greenlet (Aves: Passeriformes: Vireonidae)". Zootaxa. 3884 (2): 194–196. doi:10.11646/zootaxa.3884.2.8. PMID 25543778.
  7. ↑ Buainain, N.; Maximiano, M.F.A.; Ferreira, M.; Aleixo, A.; Faircloth, B.C.; Brumfield, R.T.; Cracraft, J.; Ribas, C.C. (2021). "Multiple species and deep genomic divergences despite little phenotypic differentiation in an ancient Neotropical songbird, Tunchiornis ochraceiceps (Sclater, 1860) (Aves: Vireonidae)". Molecular Phylogenetics and Evolution. 162 107206. doi:10.1016/j.ympev.2021.107206.
  8. 1 2 Clements, J. F., P. C. Rasmussen, T. S. Schulenberg, M. J. Iliff, J. A. Gerbracht, D. Lepage, A. Spencer, S. M. Billerman, B. L. Sullivan, M. Smith, and C. L. Wood. 2025. The eBird/Clements checklist of Birds of the World: v2025. Downloaded from https://www.birds.cornell.edu/clementschecklist/download/ retrieved November 3, 2025
  9. 1 2 3 AviList Core Team (2025). "AviList: The Global Avian Checklist, v2025". Retrieved June 11, 2025.
  10. ↑ Remsen, J. V., Jr., J. I. Areta, E. Bonaccorso, S. Claramunt, D. F. Lane, L, N. Naka, M. B. Robbins, F. G. Stiles, and K. J. Zimmer. Version 25 July 2026. A classification of the bird species of South America. South American Classification Committee associated with the International Ornithologists' Union. https://www.museum.lsu.edu/~Remsen/SACCBaseline.htm retrieved 25 July 2026
  11. ↑ HBW and BirdLife International (2025). Handbook of the Birds of the World and BirdLife International digital checklist of the birds of the world. Version 10. Available at: https://datazone.birdlife.org/about-our-science/taxonomy#birdlife-s-taxonomic-checklist retrieved October 12, 2025
  12. ↑ James Van Remsen Jr. (June 2026). "Proposal (1076.2) to South American Classification Committee: Revise English names in Tunchiornis". South American Classification Committee. Retrieved July 27, 2026.
  13. ↑ Remsen, J. V., Jr., J. I. Areta, E. Bonaccorso, S. Claramunt, D. F. Lane, L, N. Naka, M. B. Robbins, F. G. Stiles, and K. J. Zimmer. Version 25 July 2026. A classification of the bird species of South America: Recent Changes. South American Classification Committee associated with the International Ornithologists' Union. https://www.museum.lsu.edu/~Remsen/SACCRecentChanges.htm retrieved 25 July 2026
  14. 1 2 3 4 5 6 7 8 9 Remsen Jr., J. V., G. M. Kirwan, P. F. D. Boesman, D. Brewer, J. del Hoyo, and N. Collar (2025). Rufous-fronted Greenlet (Tunchiornis ferrugineifrons), version 1.0. In Birds of the World (S. M. Billerman, Editor). Cornell Lab of Ornithology, Ithaca, NY, USA. https://doi.org/10.2173/bow.tacgre4.01 retrieved July 28, 2026
  15. 1 2 3 van Perlo, Ber (2009). A Field Guide to the Birds of Brazil. New York: Oxford University Press. pp. 338–339. ISBN 978-0-19-530155-7.
  16. 1 2 3 McMullan, Miles; Donegan, Thomas M.; Quevedo, Alonso (2010). Field Guide to the Birds of Colombia. Bogotá: Fundación ProAves. p. 178. ISBN 978-0-9827615-0-2.
  17. 1 2 3 Hilty, Steven L. (2003). Birds of Venezuela (second ed.). Princeton NJ: Princeton University Press. p. 681.
  18. ↑ Ridgely, Robert S.; Greenfield, Paul J. (2001). The Birds of Ecuador: Field Guide. Vol. II. Ithaca: Cornell University Press. p. 571. ISBN 978-0-8014-8721-7.
  19. 1 2 Schulenberg, T.S.; Stotz, D.F.; Lane, D.F.; O'Neill, J.P.; Parker, T.A. III (2010). Birds of Peru. Princeton Field Guides (revised and updated ed.). Princeton, NJ: Princeton University Press. p. 508. ISBN 978-0691130231.
  20. ↑ BirdLife International (2022). "Tawny-crowned Greenlet Tunchiornis ochraceiceps". IUCN Red List of Threatened Species. 2022 e.T216918900A217550252. doi:10.2305/IUCN.UK.2022-2.RLTS.T216918900A217550252.en. Retrieved 28 July 2026.
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