Copper-rumped Hummingbird

The copper-rumped hummingbird (''Saucerottia tobaci'') is a species of hummingbird in the "emeralds", tribe Trochilini of subfamily Trochilinae. It is found in Tobago, Trinidad, Venezuela, and possibly Grenada.

Taxonomy and systematics

The copper-rumped hummingbird was formally described in 1788 by the German naturalist Johann Friedrich Gmelin in his revised and expanded edition of Carl Linnaeus's ''Systema Naturae''. He placed it with all the other hummingbirds in the genus ''Trochilus'' and coined the binomial name ''Trochilus tobaci''. Gmelin based his description on the "Tobago Humming-Bird" that had been described in 1782 by the English ornithologist John Latham in his ''A General Synopsis of Birds''. The copper-rumped hummingbird was formerly placed in the genus ''Amazilia''. A molecular phylogenetic study published in 2014 found that the genus ''Amazilia'' was polyphyletic. In the revised classification to create monophyletic genera, the copper-rumped hummingbird was moved by most taxonomic systems to the resurrected genus ''Saucerottia''.Remsen, J. V., Jr., J. I. Areta, E. Bonaccorso, S. Claramunt, A. Jaramillo, D. F. Lane, J. F. Pacheco, M. B. Robbins, F. G. Stiles, and K. J. Zimmer. Version 24 July 2022. A classification of the bird species of South America. American Ornithological Society. https://www.museum.lsu.edu/~Remsen/SACCBaseline.htm retrieved July 24, 2022Clements, J. F., T. S. Schulenberg, M. J. Iliff, S. M. Billerman, T. A. Fredericks, J. A. Gerbracht, D. Lepage, B. L. Sullivan, and C. L. Wood. 2021. The eBird/Clements checklist of Birds of the World: v2021. Downloaded from https://www.birds.cornell.edu/clementschecklist/download/ Retrieved August 25, 2021 However, BirdLife International's ''Handbook of the Birds of the World'' (HBW) retains it in ''Amazilia''.

The genus ''Saucerottia'' had been introduced in 1850 by the French naturalist Charles Lucien Bonaparte. The genus name is from the specific epithet ''saucerrottei'' for the steely-vented hummingbird, the type species. The epithet was coined in 1846 by Adolphe Delattre and Jules Bourcier to honor the French physician and ornithologist Antoine Constant Saucerotte. The specific epithet ''tobaci'' is from the island of Tobago, the type locality.

These seven subspecies of copper-rumped hummingbird are recognised by world-wide taxonomic systems:

* ''S. t. monticola'' Todd, 1913
* ''S. t. feliciae'' ( Lesson, R, 1840)
* ''S. t. caudata'' ( Zimmer, JT & Phelps, 1949)
* ''S. t. aliciae'' (Richmond, 1895)
* ''S. t. erythronotos'' (Lesson, R, 1829)
* ''S. t. tobaci'' (Gmelin, JF, 1788)
* ''S. t. caurensis'' Berlepsch & Hartert, E, 1902

Description

The copper-rumped hummingbird is long. Males weigh and females . The nominate subspecies ''S. t. tobaci'' is the largest. Both sexes of all subspecies have a straight, medium length, blackish bill with a pinkish base to the mandible. Males of ''S. t. tobaci'' have bronze-green upperparts with purple-red uppertail coverts. They have dark golden-green underparts with reddish brown undertail coverts. Their tail is purplish black. Adult females are similar though their upperparts are a less intense bronze-green and they have some whitish on the chin and upper throat. Juveniles resemble females but have some grayish brown on the throat and belly.Weller, A.A., P. F. D. Boesman, and G. M. Kirwan (2021). Copper-rumped Hummingbird (''Saucerottia tobaci''), version 1.1. 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.corhum1.01.1 retrieved September 8, 2022

Subspecies ''S. t. monticola'' is darker than the nominate and has a steel blue to violet-blue tail. ''S. t. feliciae''s back is more of a golden-green than the nominate's and its tail is bluish black. ''S. t. caudata'' has a dark blue tail. ''S. t. aliciae'' has some copper in its upperparts, a blue-black tail, and cinnamon-rufous undertail coverts. ''S. t. erythronotos'' has slightly darker underparts than the nominate and some dark purplish in the uppertail coverts. ''S. t. caurensis'' has a grayer rump and uppertail coverts than the nominate, a dark purplish tail, and bluish black undertail coverts.

Distribution and habitat

The subspecies of copper-rumped hummingbird are found thus:

* ''S. t. monticola'', the northwestern Venezuelan states of Falcón, Lara, and Yaracuy
* ''S. t. feliciae'', north and central Venezuela between Carabobo and Anzoátegui and south to Táchira, Apure, and Guárico
* ''S. t. caudata'', northeastern Venezuela's states of Sucre and Monagas
* ''S. t. aliciae'', Margarita Island off the coast of Venezuela
* ''S. t. erythronotos'', Trinidad
* ''S. t. tobaci'', Tobago
* ''S. t. caurensis'' Bolívar and Amazonas states in southeastern Venezuela

Specimens of this species labeled as from Grenada are believed to have been actually collected on Tobago, and "the occurrence of the species in the Lesser Antilles is doubtful."

The copper-rumped hummingbird inhabits a wide variety of forest types including gallery forest, cloudforest, rainforest, and secondary forest. ''S. t. erythronotos'' and ''S. t. tobaci'' are also found in savanna, plantations, and gardens. Most subspecies range in elevation from sea level to though ''monticola'' and ''feliciae'' can be found as high as and ''aliciae'' is seldom found at low elevation.

Behavior

Movement

The island subspecies of copper-rumped hummingbird are sedentary; the mainland ones make some local movements.

Feeding

The copper-rumped hummingbird forages for nectar from at least 40 species of trees, vines, herbs, and other plants including introduced species. It is extremely territorial and vigorously defends feeding areas from other birds, even larger ones. In addition to nectar it feeds on small insects by hawking from a perch or by gleaning from vegetation.

Breeding

The copper-rumped hummingbird's breeding season on Trinidad is almost year-round, excluding only September and October; its peak is from January to March. On Tobago it spans at least from November to June. The breeding seasons of mainland subspecies are essentially unknown. The species builds a nest of silky plant down with lichen on the outside. It places it like a saddle in a fork or on a small branch, usually between above the ground but occasionally as high as . Nests have also been found on wires and clotheslines. The female incubates the clutch of two eggs for 16 to 19 days and fledging occurs 19 to 23 days after hatch. Up to three broods may be produced each season.

Vocalization

The copper-rumped hummingbird's song is "a repeated phrase of three buzzy or squeaky, well-spaced notes 'tee-dee-dew' or 'tee-dzee-djit'." It also makes "high-pitched descending rattles" when foraging.

Status

The IUCN has assessed the copper-rumped hummingbird as being of Least Concern, though its population size and trend are unknown. It has a large range and no immediate threats have been identified. Those on Trinidad and Tobago and the mainland subspecies ''S. t. feliciae'' and ''S. t. caudata'' are considered common to very common. The other subspecies appear to be more scattered, though this might be due to incomplete data.

References

Further reading

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{{Taxonbar, from=Q641392

Saucerottia
Birds of Venezuela
Birds of Trinidad and Tobago
Hummingbird species of South America
Taxa named by Johann Friedrich Gmelin
Birds described in 1788
Taxobox binomials not recognized by IUCN