The island subspecies of copper-rumped hummingbird are sedentary the mainland ones make some local movements. Most subspecies range in elevation from sea level to 1,000 m (3,300 ft) though monticola and feliciae can be found as high as 2,000 m (6,600 ft) and aliciae is seldom found at low elevation. tobaci are also found in savanna, plantations, and gardens. The copper-rumped hummingbird inhabits a wide variety of forest types including gallery forest, cloudforest, rainforest, and secondary forest. 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." caurensis Bolívar and Amazonas states in southeastern Venezuela aliciae, Margarita Island off the coast of Venezuela caudata, northeastern Venezuela's states of Sucre and Monagas feliciae, north and central Venezuela between Carabobo and Anzoátegui and south to Táchira, Apure, and Guárico monticola, the northwestern Venezuelan states of Falcón, Lara, and Yaracuy The subspecies of copper-rumped hummingbird are found thus: caurensis has a grayer rump and uppertail coverts than the nominate, a dark purplish tail, and bluish black undertail coverts. erythronotos has slightly darker underparts than the nominate and some dark purplish in the uppertail coverts. aliciae has some copper in its upperparts, a blue-black tail, and cinnamon-rufous undertail coverts. feliciae 's back is more of a golden-green than the nominate's and its tail is bluish black. monticola is darker than the nominate and has a steel blue to violet-blue tail. Juveniles resemble females but have some grayish brown on the throat and belly. Adult females are similar though their upperparts are a less intense bronze-green and they have some whitish on the chin and upper throat. They have dark golden-green underparts with reddish brown undertail coverts. tobaci have bronze-green upperparts with purple-red uppertail coverts. Both sexes of all subspecies have a straight, medium length, blackish bill with a pinkish base to the mandible. The copper-rumped hummingbird is 9 to 11 cm (3.5 to 4.3 in) long. These seven subspecies of copper-rumped hummingbird are recognised by world-wide taxonomic systems: The specific epithet tobaci is from the island of Tobago, the type locality. The epithet was coined in 1846 by Adolphe Delattre and Jules Bourcier to honor the French physician and ornithologist Antoine Constant Saucerotte. The genus name is from the specific epithet saucerrottei for the steely-vented hummingbird, the type species. The genus Saucerottia had been introduced in 1850 by the French naturalist Charles Lucien Bonaparte. However, BirdLife International's Handbook of the Birds of the World (HBW) retains it in Amazilia. In the revised classification to create monophyletic genera, the copper-rumped hummingbird was moved by most taxonomic systems to the resurrected genus Saucerottia. A molecular phylogenetic study published in 2014 found that the genus Amazilia was polyphyletic. The copper-rumped hummingbird was formerly placed in the genus Amazilia. 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. He placed it with all the other hummingbirds in the genus Trochilus and coined the binomial name Trochilus tobaci. 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. It is found in Tobago, Trinidad, Venezuela, and possibly Grenada. The copper-rumped hummingbird ( Saucerottia tobaci) is a species of hummingbird in the "emeralds", tribe Trochilini of subfamily Trochilinae.
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