swallow tanager

{{Short description|Species of bird}}

{{Speciesbox

| image = Swallow Tanager (Tersina viridis)..jpg

| image_caption = Female

| image2 = Tersina viridis -Parana, Brazil -male-8.jpg

| image2_caption = Male in Paraná, Brazil

| status = LC

| status_system = IUCN3.1

| status_ref = {{cite iucn |author=BirdLife International |date=2016 |title=Tersina viridis |volume=2016 |page=e.T22723018A94799455 |doi=10.2305/IUCN.UK.2016-3.RLTS.T22723018A94799455.en |access-date=12 November 2021}}

| genus = Tersina

| parent_authority = Vieillot, 1819

| species = viridis

| authority =(Illiger, 1811)

| range_map = Tersina viridis map.svg

}}

The swallow tanager (Tersina viridis) is a species of Neotropic bird in the tanager family Thraupidae. It is the only member of the genus Tersina. It is found widely throughout South America, from eastern Panama to far northern Argentina. The species is sexually dimorphic: the female is a yellow-green and the male a turquoise blue with a small deep black face and upper throat patch.

Taxonomy

The swallow tanager was formally described in 1811 by the German zoologist Johann Karl Wilhelm Illiger under the binomial name Hirundo viridis.{{ cite book | last=Illiger | first=Johann Karl Wilhelm | author-link=Johann Karl Wilhelm Illiger | year=1811 | title=Prodromus systematis mammalium et avium | language=Latin | location=Berolini [Berlin] | publisher=Sumptibus C. Salfeld | page=229 | url=https://www.biodiversitylibrary.org/page/29301199 }} The type locality is eastern Brazil.{{ cite book | editor-last=Paynter | editor-first=Raymond A. Jr | year=1970 | title=Check-List of Birds of the World | volume=13 | publisher=Museum of Comparative Zoology | place=Cambridge, Massachusetts | page=409 | url=https://www.biodiversitylibrary.org/page/14483644 }} The species is now the only member of the genus Tersina that was introduced in 1819 by the French ornithologist Louis Pierre Vieillot.{{ cite book | last=Vieillot | first=Louis Pierre | author-link=Louis Pierre Vieillot | year=1819 | title=Nouveau dictionnaire d'histoire naturelle, appliquée aux arts, à l'agriculture, à l'économie rurale et domestique, à la médecine, etc. | volume=33 | place=Paris | publisher=Deterville |page=401 | doi=10.5962/bhl.title.20211 | language=French | url=https://www.biodiversitylibrary.org/page/19472932 }}{{cite web| editor1-last=Gill | editor1-first=Frank | editor1-link=Frank Gill (ornithologist) | editor2-last=Donsker | editor2-first=David | editor3-last=Rasmussen | editor3-first=Pamela | editor3-link=Pamela Rasmussen | date=July 2020 | title=Tanagers and allies | work=IOC World Bird List Version 10.2 | url=https://www.worldbirdnames.org/bow/tanagers/ | publisher=International Ornithologists' Union | access-date=23 October 2020 }} The genus name is from the French Tersine, an unidentified bird described by Georges-Louis Leclerc, Comte de Buffon. The specific epithet viridis is the Latin for "green".{{cite book | last=Jobling | first=James A. | year=2010| title=The Helm Dictionary of Scientific Bird Names | publisher=Christopher Helm | location=London | isbn=978-1-4081-2501-4 | pages=382, 403 }} A molecular phylogenetic study of the tanager family published in 2014 found that the swallow tanager is sister to the honeycreepers in the genus Cyanerpes.{{cite journal| last1=Burns | first1=K.J. | last2=Shultz | first2=A.J. | last3=Title | first3=P.O. | last4=Mason | first4=N.A. | last5=Barker | first5=F.K. | last6=Klicka | first6=J. | last7=Lanyon | first7=S.M. | last8=Lovette | first8=I.J. | year=2014 | title=Phylogenetics and diversification of tanagers (Passeriformes: Thraupidae), the largest radiation of Neotropical songbirds | journal=Molecular Phylogenetics and Evolution| volume=75| pages=41–77 | doi=10.1016/j.ympev.2014.02.006 | pmid=24583021 | bibcode=2014MolPE..75...41B | url=https://digitalcommons.lsu.edu/cgi/viewcontent.cgi?article=3613&context=biosci_pubs | url-access=subscription }}

Three subspecies are recognised:

  • T. v. grisescens Griscom, 1929 – north Colombia
  • T. v. occidentalis (Sclater, PL, 1855) – east Panama and Colombia (except north) east to the Guianas and north Brazil and south to Bolivia (except southeast) and northwest Argentina
  • T. v. viridis (Illiger, 1811) – east, south Brazil, southeast Bolivia, Paraguay and northeast Argentina

Description

The swallow tanager is {{cvt|14.5|-|15|cm}} in length with a broad flat bill. This bird is strongly sexually dimorphic. The male is bright turquoise blue with a black face and throat. The turquoise flanks have black barring and the lower belly is white. The female is bright green with dusky-olive barring on the flanks. She lacks the black face mask.{{ cite book | last1=Ridgely | first1=Robert S. | last2=Tudor | first2=Guy | year=2009 | title=Birds of South America: Passerines | series=Helm Field Guides | place=London | publisher=Christopher Helm | isbn=978-1-408-11342-4 | page=600 }} They are gregarious but do not associate with other species. They mainly eat fruit but they will also sally after insects from an exposed perch. The swallow tanagers are unique among tanagers in that they will sometimes dig a hole in a bank for a nest.

References

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