Introduction
The Beautiful Sheartail, also called the Beautiful Hummingbird, is a small hummingbird endemic to south-central Mexico. Its accepted scientific name is Calothorax pulcher. The species is recognised for the male’s brilliant violet-magenta throat, metallic green upperparts and strongly forked tail.
Physical Description
The Beautiful Sheartail is a small hummingbird, measuring approximately 7.7–8.7 centimetres in length and weighing about 2.2–2.7 grams.
Adult males have metallic bronze-green upperparts, a white stripe behind the eye and a vivid magenta to violet gorget on the throat. The gorget feathers are elongated at the sides, giving the head and neck a distinctive, ornate appearance. The breast is greyish white, the flanks are metallic green and the undertail coverts are white. The tail is long and forked, with bronze-green central feathers and darker outer feathers.
Females are much less brightly coloured. They have duller bronze-green upperparts, pale greyish-buff underparts and cinnamon-buff flanks. Their tail is shorter and more rounded than the male’s, with green central feathers and darker outer feathers marked with pale tips. Juveniles and immature males are generally less distinctive than adult males and may resemble females until the adult throat plumage develops.
Range and Habitat
The Beautiful Sheartail is endemic to Mexico. Its known range extends from central Guerrero and southern Puebla southwards through Oaxaca, particularly in the dry interior valleys of south-central Mexico.
It occupies arid and semi-arid montane scrub, semi-open areas with trees and shrubs, and gallery or riparian vegetation. It is most often associated with flowering plants in dry valleys, thorn scrub and areas containing cacti or other succulents. Documented records generally fall between about 1,000 and 2,250 metres above sea level.
The species is generally regarded as a resident, although some individuals may move to lower elevations in Oaxaca after breeding. The distribution is restricted and local, so suitable habitat can be separated by large areas of unsuitable terrain.
Where to See This Species
Tehuacán-Cuicatlán Biosphere Reserve, Puebla and Oaxaca, Mexico
The Tehuacán-Cuicatlán Biosphere Reserve contains dry interior valleys, columnar-cactus vegetation, scrub and riparian habitats that are suitable for the Beautiful Sheartail. The species is included in the reserve’s documented bird records and has also been recorded in studies of hummingbirds and their flower resources. Look for it around flowering shrubs, cacti and semi-open valley vegetation, particularly during the local flowering season. Identification should be made carefully because the closely related Lucifer Sheartail can occur in parts of the wider region.
Nearby accommodation: Tehuacán and Cuicatlán are practical gateway settlements, with hotels, guest houses and other small-scale accommodation in the surrounding towns and villages.
Behaviour and Diet
The Beautiful Sheartail is active during the day and uses rapid, agile flight to move between flowers, perches and sheltered vegetation. Like other hummingbirds, it can hover while feeding and may make short, direct flights between feeding sites.
Its diet consists mainly of nectar from a variety of flowering plants. It also takes small insects and spiders, which provide protein and other nutrients. The species often forages close to the ground, although it may feed at different heights depending on the position of flowers.
Males perform courtship displays that include hovering or rocking movements in front of a female, followed by diving and swooping flights. The species is not known to form a lasting pair bond. The female builds the nest and cares for the young. One documented nest was a small cup made from fine plant down and attached to a branch with spider silk. Clutches contain two eggs, but detailed information about incubation and fledging remains limited.
Identification Tips
- Look for a small hummingbird with a slightly decurved black bill and a long, forked tail.
- Adult males are recognised by the metallic magenta-violet gorget, white post-eye stripe, green upperparts and pale breast.
- Females are duller, with pale greyish-buff underparts, cinnamon-buff flanks and a shorter, more rounded tail.
- The strongly forked male tail and brilliant throat help distinguish the species from many other hummingbirds in dry Mexican valleys.
- Take care when separating it from the closely related Lucifer Sheartail, especially in areas where their ranges or seasonal movements may overlap. Tail shape, gorget structure, bill proportions and the exact location should be considered together rather than relying on a single feature.
Conservation Status
The Beautiful Sheartail is currently assessed as Least Concern on the IUCN Red List. This status does not mean that local populations are secure everywhere. The species has a restricted range, and the dry valleys and scrublands on which it depends can be affected by agricultural expansion, urban development, overgrazing, vegetation clearance and changes to native flowering plants.
Protecting intact scrub, cactus-rich slopes, valley vegetation and riparian habitat is important for maintaining feeding and breeding resources. Conservation areas such as the Tehuacán-Cuicatlán Biosphere Reserve provide protection for part of the species’ range. Further field surveys and population monitoring would help clarify local abundance, movements and long-term trends.
Frequently Asked Questions
Where does the Beautiful Sheartail live?
The species is endemic to south-central Mexico, occurring from central Guerrero and southern Puebla southwards through Oaxaca. It favours dry interior valleys, arid and semi-arid scrub, semi-open woodland and gallery vegetation.
What does the Beautiful Sheartail look like?
The adult male has metallic green upperparts, a vivid magenta-violet throat, a pale breast and a long forked tail. The female is less colourful, with dull green upperparts, pale underparts, cinnamon-buff flanks and a shorter, rounded tail.
What does the Beautiful Sheartail eat?
It feeds mainly on nectar from flowering plants and supplements its diet with small insects and spiders. It may forage close to the ground or at other heights where flowers and prey are available.
Is the Beautiful Sheartail migratory?
It is generally considered a resident species. Some individuals may make local or seasonal movements to lower elevations in Oaxaca after breeding, but the extent of these movements is not fully understood.
Where is the best documented place to look for this species?
The Tehuacán-Cuicatlán Biosphere Reserve in Puebla and Oaxaca is a documented site for the species. Dry scrub, columnar-cactus vegetation, flowering plants and riparian habitats within the reserve provide suitable places to search.
Is the Beautiful Sheartail endangered?
No. It is currently classified as Least Concern, although habitat loss and degradation remain potential threats because the species has a restricted distribution and depends on native dry-valley vegetation.
References
- International Ornithologists’ Union, IOC World Bird List
- IUCN Red List of Threatened Species
- Comisión Nacional de Áreas Naturales Protegidas, Tehuacán-Cuicatlán Biosphere Reserve Management Programme
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