The olivaceous elaenia (Elaenia mesoleuca) is a species of bird in subfamily Elaeniinae of family Tyrannidae, the tyrant flycatchers.[2] It is found in Argentina, Brazil, Paraguay, and Uruguay.[3]
| Olivaceous elaenia | |
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Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Aves |
| Order: | Passeriformes |
| Family: | Tyrannidae |
| Genus: | Elaenia |
| Species: | E. mesoleuca
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| Binomial name | |
| Elaenia mesoleuca (Deppe, 1830)
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Taxonomy and systematics
editThough one mid-late twentieth century publication credited Lichtenstein with the species description, since the 1990s taxonomic systems attribute it to Deppe.[4][5][2][6][7]
Description
editThe olivaceous elaenia is 14 to 16 cm (5.5 to 6.3 in) long and weighs 16 to 20 g (0.56 to 0.71 oz). It is a small elaenia without a crest. The sexes have the same plumage. Adults have a dull olive crown with minimal or no white in the middle. They have a white eyering. Their upperparts are dull olive. Their wings are dusky with yellowish or white tips on the coverts that show as two wing bars. Their flight feathers have narrow whitish edges. Their tail is dusky. Their throat is dull gray, their breast olive in a vest-like pattern, their belly white, and their flanks and undertail coverts whitish with a yellow wash. Both sexes have a brown iris, a black bill with a dusky pinkish base to the mandible, and black legs and feet.[8][9][10]
Distribution and habitat
editThe olivaceous elaenia is found from southern Goiás and southern Bahia in eastern Brazil south through eastern Paraguay and into eastern Uruguay and northern Argentina's Formosa, Chaco, and Misiones provinces.[8][9][10] Its first record in Uruguay did not come until 2000.[11] The olivaceous elaenia inhabits interior, edges, and clearings of humid tropical forest and also gallery forest, secondary forest, and more open woodlands. In elevation it ranges from sea level to 2,000 m (6,600 ft).[8][9][10]
Behavior
editMovement
editThe olivaceous elaenia appears to be at least a partial migrant. Though the species is a year-round resident in much of its range there appears to be a northward shift during the austral winter.[8][9]
Feeding
editThe olivaceous elaenia feeds on insects and small fruits. It captures prey and plucks fruit by gleaning while perched and also captures flying insects on the wing.[8]
Breeding
editThe olivaceous elaenia's breeding season appears to span from September to April. Its nest is a cup made from moss, plant fibers, and fungal haphae with lichens on the outside. It is typically placed in a branch fork between 4 and 9 m (10 and 30 ft) above the ground. The clutch is two or three eggs. The incubation period is 15 to 16 days and fledging occurs about 20 days after hatch.[8]
Vocalization
editThe olivaceous elaenia's primary vocalization is a "clapping 'Vrih' or 'Vri-der', single or in series".[9] Other vocalizations include " 'chirr', and variety of quick single notes such as 'pic', 'oink' and 'wow' ".[8]
Status
editThe IUCN has assessed the olivaceous elaenia as being of Least Concern. It has a large range; its population size is not known and is believed to be decreasing. No immediate threats have been identified.[1] It is considered locally fairly common to common and occurs in several national parks and other protected areas.[8]
References
edit- ^ a b BirdLife International (2018). "Olivaceous Elaenia Elaenia mesoleuca". IUCN Red List of Threatened Species. 2018: e.T22699280A130202634. doi:10.2305/IUCN.UK.2018-2.RLTS.T22699280A130202634.en. Retrieved 28 September 2024.
- ^ a b c Gill, Frank; Donsker, David; Rasmussen, Pamela, eds. (August 2024). "Tyrant flycatchers". IOC World Bird List. v 14.2. Retrieved 19 August 2024.
- ^ Remsen, J. V., Jr., J. I. Areta, E. Bonaccorso, S. Claramunt, G. Del-Rio, A. Jaramillo, D. F. Lane, M. B. Robbins, F. G. Stiles, and K. J. Zimmer. Version 27 July 2024. Species Lists of Birds for South American Countries and Territories. https://www.museum.lsu.edu/~Remsen/SACCCountryLists.htm retrieved July 28, 2024
- ^ Amadon, Dean; Mayr, Ernst; Snow, David W.; Traylor, Melvin A. Jr.; Zimmer, John T. (1979). Check-list of Birds of the World. Vol. 8. Harvard University Press. p. 31.
- ^ Browning, M. Ralph; Monroe, Burt L. Jr. (1991). "Clarifications and corrections of the dates of issue of some publications containing descriptions of North American birds". Archives of Natural History. 18 (3): 381–405. doi:10.3366/anh.1991.18.3.381. Retrieved September 28, 2024.
- ^ Clements, J. F., P.C. Rasmussen, T. S. Schulenberg, M. J. Iliff, T. A. Fredericks, J. A. Gerbracht, D. Lepage, A. Spencer, S. M. Billerman, B. L. Sullivan, and C. L. Wood. 2023. The eBird/Clements checklist of birds of the world: v2023. Downloaded from https://www.birds.cornell.edu/clementschecklist/download/ retrieved October 28, 2023
- ^ HBW and BirdLife International (2024). Handbook of the Birds of the World and BirdLife International digital checklist of the birds of the world. Version 8.1. Available at: https://datazone.birdlife.org/species/taxonomy retrieved August 26, 2024
- ^ a b c d e f g h Hosner, P. (2020). Olivaceous Elaenia (Elaenia mesoleuca), version 1.0. In Birds of the World (J. del Hoyo, A. Elliott, J. Sargatal, D. A. Christie, and E. de Juana, Editors). Cornell Lab of Ornithology, Ithaca, NY, USA. https://doi.org/10.2173/bow.oliela1.01 retrieved September 28, 2024
- ^ a b c d e van Perlo, Ber (2009). A Field Guide to the Birds of Brazil. New York: Oxford University Press. pp. 292–293. ISBN 978-0-19-530155-7.
- ^ a b c de la Peña, Martín R.; Rumboll, Maurice (2001). Birds of Southern South America and Antarctica. Princeton Illustrated Checklists. New Jersey: Princeton University Press. pp. Plate 70, map 70.17. ISBN 0691090351.
- ^ Claramunt, Santiago; Rocha, Gabriel (2001). "Hallazgo de Elaenia mesoleuca en Uruguay (Aves: Passeriformes: Tyrannidae)" (PDF). Comunicaciones Zoológicas del Museo de Historia Natural y Antropología. 13 (199): 1–4.