Introduction
Xantus’s Hummingbird (Basilinna xantusii) is a small, stocky hummingbird endemic to the Baja California Peninsula of Mexico. It is named after the Hungarian zoologist John Xantus de Vesey and is especially notable for its black facial mask, broad white ear-stripe, green plumage and rusty tail.
Physical Description
Xantus’s Hummingbird measures approximately 8–10 centimetres in length, with a wingspan of about 10–13 centimetres and a weight of roughly 3–6 grams. It has a straight bill, a red base and black tip in adult males, and a darker bill in females.
Both sexes have green upperparts, a dark facial mask, a prominent white stripe behind the eye and a rusty or cinnamon-coloured tail. Adult males have a glittering green throat, a darker forehead and chin, and cinnamon underparts. Females are generally duller, with pale cinnamon underparts and a less strongly iridescent throat.
Immature birds resemble females, although young males may gradually develop green throat feathers and stronger adult facial markings as they mature.
Range and Habitat
Xantus’s Hummingbird is resident in central and southern Baja California, Mexico, including parts of Baja California Sur and some islands in the Gulf of California. It is endemic to the peninsula, although occasional individuals have wandered north into the United States and Canada.
The species uses a broad range of habitats, including arid scrub, dry woodland, thorn forest, mountain canyons, pine-oak woodland, gardens, orchards and areas near streams or springs. It occurs from near sea level into montane habitats, with local distribution influenced by flowering plants, water availability and shelter.
It is not considered a regular long-distance migrant. Individuals may move locally or seasonally in response to flowering conditions and the availability of nectar and small invertebrate prey.
Where to See This Species
Sierra La Laguna Biosphere Reserve, Baja California Sur, Mexico
Sierra La Laguna protects dry tropical forest, semi-desert vegetation and the only pine-oak woodland in Baja California Sur. Xantus’s Hummingbird is a recognised species of conservation interest in the reserve, and local conservation activities have specifically highlighted the species. Birdwatchers should look along forest edges, flowering scrub, riparian areas and trails, particularly during the recommended visiting period from October to May.
Nearby accommodation: Los Cabos is the most practical base for hotels and other established accommodation, while camping is available within the reserve where permitted.
Cabo San Lucas Area of Protection of Flora and Fauna, Baja California Sur, Mexico
The protected area around Cabo San Lucas includes arid coastal habitats, scrub and flowering vegetation used by the species. Xantus’s Hummingbird is listed among the area’s representative endemic birds. Look in native scrub, vegetated ravines, gardens and other flowering habitats, especially during cooler months when bird activity may be easier to observe.
Nearby accommodation: Cabo San Lucas provides the nearest major accommodation base, including hotels, guest houses and self-catering accommodation.
Loreto National Park Area, Baja California Sur, Mexico
Official planning documents for Loreto National Park identify Xantus’s Hummingbird as an endemic bird of the Baja California Peninsula occurring in the protected area. The most promising locations are likely to be vegetated desert habitats, dry woodland, canyons and gardens around Loreto, rather than open water or barren coastal ground.
Nearby accommodation: Loreto is the practical gateway, with hotels, guest houses and self-catering accommodation.
Behaviour and Diet
Xantus’s Hummingbird is usually encountered alone and spends much of its time moving rapidly between flowers, perches and sheltered vegetation. It hovers while feeding and may defend productive flowers or feeding areas from other hummingbirds and larger intruders.
Nectar forms the main part of its diet. The bird also takes small insects and spiders, which provide protein and other nutrients, particularly during breeding. By visiting flowers, it contributes to pollination in the dry forests, scrublands and mountain habitats where it occurs.
Breeding behaviour includes aerial chases and courtship flights by males. The female is responsible for constructing the small cup-shaped nest, incubating the eggs and feeding the young. Nests are made from soft plant material and bound with spider silk, often with lichen or other materials added for camouflage. A typical clutch contains two white eggs, and the young remain dependent on the female for several weeks after hatching.
Identification Tips
Look for a medium-sized, compact hummingbird with the following combination of features:
- A broad white stripe behind the eye.
- A dark mask and blackish forehead, especially obvious in males.
- Green upperparts and cinnamon underparts.
- A rusty or chestnut-coloured tail, often with green central feathers.
- A red-based bill with a black tip in adult males.
- Rapid hovering flight and a preference for flowering scrub, woodland edges and gardens.
Within its restricted range, the combination of the white ear-stripe, cinnamon underparts and rusty tail makes it distinctive. The related White-eared Hummingbird has a similar white facial stripe but generally occurs outside the Xantus’s Hummingbird’s Baja California range and has different overall plumage, including a more contrasting adult male throat.
Conservation Status
Xantus’s Hummingbird is currently assessed as Least Concern on the IUCN Red List. Its range is geographically restricted, but the species remains locally common in suitable habitat and occurs in several protected areas.
Potential pressures include habitat alteration, overgrazing and changes to the flowering plants and water sources on which the species depends. Urban development, tourism infrastructure and the degradation of dry forest, scrub and riparian vegetation may affect local populations. Protected areas such as Sierra La Laguna, the Cabo San Lucas protected area and Loreto National Park are important for conserving habitat within its range.
Frequently Asked Questions
Where is Xantus’s Hummingbird found?
It is endemic to the Baja California Peninsula in Mexico, particularly central and southern Baja California and Baja California Sur. It also occurs on some islands in the Gulf of California.
Is Xantus’s Hummingbird migratory?
It is generally regarded as a resident species rather than a long-distance migrant. Local movements may occur when flowering conditions, water availability or food supplies change.
What does Xantus’s Hummingbird eat?
It feeds mainly on nectar from flowering plants, supplemented by small insects and spiders. Invertebrate prey is especially important during breeding and when adults are feeding young.
How can Xantus’s Hummingbird be identified?
The most useful features are the bold white stripe behind the eye, dark facial mask, green upperparts, cinnamon underparts and rusty tail. Adult males also show a glittering green throat and a red-based bill with a black tip.
Where is the best place to see Xantus’s Hummingbird?
Protected areas in Baja California Sur offer some of the most reliable opportunities, including Sierra La Laguna Biosphere Reserve, the Cabo San Lucas Area of Protection of Flora and Fauna and the Loreto National Park area. Flowering scrub, dry woodland, canyons and gardens are good habitats to check.
What is the conservation status of Xantus’s Hummingbird?
The species is classified as Least Concern by the IUCN. Its restricted range means that protection of dry forest, scrub, riparian vegetation and flowering plants remains important.
References
- IUCN Red List of Threatened Species
- IOC World Bird List
- Comisión Nacional de Áreas Naturales Protegidas
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