Tropical kingbird

The tropical kingbird (Tyrannus melancholicus) is a large tyrant flycatcher. This bird breeds from southern Arizona and the lower Rio Grande Valley of Texas in the United States through Central America, South America as far as south as central Argentina and eastern Peru, and on Trinidad and Tobago. Birds from the northernmost and southern breeding areas migrate to warmer parts of the range after breeding.

Tropical kingbird
T. m. melancholicus
The Pantanal, Brazil
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Passeriformes
Family: Tyrannidae
Genus: Tyrannus
Species:
T. melancholicus
Binomial name
Tyrannus melancholicus
Vieillot, 1819
Purple = year-round range; orange = breeding range

Description and ecology

An adult tropical kingbird is 22 cm (8.7 in) long, weighs 39 g (1.4 oz) and has a wingspan range of 38–41 cm.[2] The head is pale gray, with a darker eye mask, an orange crown stripe, and a heavy gray bill. The back is grayish-green, and the wing and forked tail are brown. The throat is pale gray, becoming olive on the breast, with the rest of the underparts being yellow. The sexes are similar, but young birds have pale buff edges on the wing coverts.

Tropical Kingbirds appear to be monogamous. In most parts of the species' range, they are permanent residents and remain together in pairs year-round.(Sibley 2014) The call is a high-pitched twittering trill, tree-e-e-e-e-e-e, with a more complex version sung by the male at dawn.

Their breeding habitat is semi-open areas with trees and shrubs, including gardens and roadsides. Tropical kingbirds like to observe their surroundings from a prominent open perch, usually high in a tree, undertaking long flights to acrobatically catch insects in mid-air (hawking), sometimes hovering to pick food off vegetation (gleaning).[3][4] They also eat some fruit from such diverse species as tamanqueiro (Alchornea glandulosa), the Annonaceae, Cymbopetalum mayanum and gumbo-limbo (Bursera simaruba);[4][5] foraging for these even in disturbed habitat. As they keep mainly to the upper levels of trees, they find little profit in following mixed-species feeding flocks in the understory.[6]

These birds aggressively defend their territory against intruders, even much larger birds such as magnificent frigatebirds, toucans, caracaras or hawks. In a study in Parque Nacional de La Macarena of Colombia, parasitism by microfilariae and trypanosomas (presumably T. everetti) was infrequently recorded in tropical kingbirds.[7]

The male and female inspect potential sites together before selecting a site, typically a fork or crotch high in a tree (up to 66 feet high) but sometimes just a few feet above water.(Sibley 2014) The female builds a bulky, sloppy-looking, shallow nest of vines, rootlets, twigs, weeds, and grasses; it is unlined or lined with hair. Nests average about 5.2 inches across and 3 inches tall, with interior cup about 3 inches across and 1.6 inches deep.[8]

The female incubates the typical clutch of two to four eggs for approximately 16 days, and the nestlings fledge in another 18 or 19 days. The eggs are whitish or pale pink with variable amounts of dark blotching.[8]

The tropical kingbird is one of the most widespread and conspicuous inhabitants of open forest, forest edge, scrub and agricultural land from the southwestern United States south to Argentina (Jahn, Stouffer, & Chesser, 2013). As a result, the bird is considered as being of Least Concern and their population is increasing, according to the IUCN.[1] According to Partners in Flight, global estimates of tropical kingbird breeding population is around 200 million. They rate the species as 4 out of 20 on the continental concern scale, indicating that this species is of low conservation concern.[9]

References

Citations
  1. BirdLife International (2016). "Tyrannus melancholicus". IUCN Red List of Threatened Species. 2016: e.T22700485A93779037. Retrieved 2 January 2020.CS1 maint: ref=harv (link)
  2. Oiseaux.net. "Tyran mélancolique - Tyrannus melancholicus - Tropical Kingbird". www.oiseaux.net. Retrieved 2020-09-26.
  3. de A. Gabriel, Vagner & Pizo, Marco A. (2005): Foraging behavior of tyrant flycatchers (Aves, Tyrannidae) in Brazil. Revista Brasileira de Zoologia 22 (4): 1072–1077 [English with Portuguese abstract]. doi:10.1590/S0101-81752005000400036 PDF fulltext
  4. Pascotto, Márcia Cristina (2006): Avifauna dispersora de sementes de Alchornea glandulosa (Euphorbiaceae) em uma área de mata ciliar no estado de São Paulo [Seed dispersal of Alchornea glandulosa (Euphorbiaceae) by birds in a gallery forest in São Paulo, southeastern Brazil.]. Revista Brasileira de Ornitologia 14 (3): 291–296 [Portuguese with English abstract]. PDF fulltext Archived 2010-11-02 at the Wayback Machine
  5. Foster, Mercedes S. (2007): The potential of fruiting trees to enhance converted habitats for migrating birds in southern Mexico. Bird Conservation International 17 (1): 45–61. doi:10.1017/S0959270906000554
  6. Machado, C. G. (1999): A composição dos bandos mistos de aves na Mata Atlântica da Serra de Paranapiacaba, no sudeste brasileiro [Mixed flocks of birds in Atlantic Rain Forest in Serra de Paranapiacaba, southeastern Brazil]. Revista Brasileira de Biologia 59 (1): 75–85 [Portuguese with English abstract]. doi:10.1590/S0034-71081999000100010 PDF fulltext
  7. Basto, Natalia; Rodríguez, Oscar A.; Marinkelle, Cornelis J.; Gutierrez, Rafael & Matta, Nubia Estela (2006): Haematozoa in birds from la Macarena National Natural Park (Colombia). Caldasia 28 (2): 371–377 [English with Spanish abstract]. PDF fulltext
  8. Sibley 2014.
  9. Partners in Flight 2017.

General sources

Further reading
  • Skutch, Alexander F. (1960). "Tropical kingbird" (PDF). Life Histories of Central American Birds II. Pacific Coast Avifauna, Number 34. Berkeley, California: Cooper Ornithological Society. pp. 349–352.
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