Introduction
The Streak-throated Hermit (Phaethornis rupurumii) is a small hummingbird in the family Trochilidae. It is also known as the Rupurumi Hermit and is associated with lowland forests, river islands and other wooded habitats in northern South America. Although it can be locally common, its ecology and breeding biology remain poorly documented.
Physical Description
The Streak-throated Hermit is a medium-small hermit hummingbird, measuring about 11 cm in length. The sexes are generally alike. Adults have predominantly olive-green upperparts, greyish to buff underparts and a long, decurved bill suited to feeding from tubular flowers.
The throat is marked with fine dark streaking or mottling, although this pattern can be difficult to see in poor light. The face usually shows a contrasting pale supercilium and malar area, while the tail is relatively long and the central feathers have pale or whitish tips. Plumage tones can vary geographically, with the amazonicus form tending to be associated with the lower Amazon basin.
Reliable information on age-related plumage differences is limited. Juveniles and recently fledged birds may appear duller than adults, but field identification should rely primarily on structure, habitat, voice and the combination of throat markings and pale tail tips.
Range and Habitat
The species has a discontinuous distribution in northern South America. The nominate form occurs from eastern Colombia through central and eastern Venezuela and western Guyana into adjacent northern Brazil, especially Roraima. The subspecies Phaethornis rupurumii amazonicus occurs farther south and east in north-central Brazil, including areas along the lower Amazon and lower Negro rivers.
The Streak-throated Hermit is mainly a lowland bird, although it has been recorded at elevations approaching 500 metres in parts of its range. It uses the shaded understory and edges of humid rainforest, várzea forest, riverine woodland, gallery forest, river islands, semi-deciduous woodland, scrub and secondary growth. The species is considered resident rather than migratory, although local movements may follow changes in flowering and the condition of riverine habitats.
Where to See This Species
Anavilhanas National Park, Amazonas, Brazil
Anavilhanas National Park, including the Anavilhanas Archipelago near Novo Airão, is one of the best-documented places to look for the species. The Streak-throated Hermit has been recorded in the park’s river-island and floodplain habitats, where dense vegetation, forest edges and understory thickets provide suitable conditions. Local birding records also indicate that it can be encountered in the archipelago rather than only in mature mainland forest.
Nearby accommodation: Novo Airão is the practical gateway, with hotels, guest houses, lodges and river-oriented accommodation.
Viruá National Park, Roraima, Brazil
Viruá National Park lies within the Brazilian portion of the species’ northern range, and the Streak-throated Hermit has been recorded there. The park’s mosaic of seasonally wet forest, woodland, savanna and river-associated vegetation offers suitable habitat, particularly in areas with dense understorey and forest margins. Visits are best planned with local guidance because access and birding opportunities can vary with seasonal conditions.
Nearby accommodation: Caracaraí is the nearest practical town, while Boa Vista provides a wider choice of hotels, guest houses and other visitor services.
Canaima National Park, Bolívar, Venezuela
The Streak-throated Hermit is included in bird lists for Canaima National Park. Within this extensive protected area, observers should concentrate on lowland forest, woodland edges, gallery vegetation and dense growth around rivers and streams rather than on the exposed tepui summits. The species is likely to be easier to locate by its repeated song or by watching quiet understory at suitable flowering plants.
Nearby accommodation: Canaima village is the main visitor base, with lodges, guest houses and camps, while Santa Elena de Uairén is a larger regional gateway with additional hotels and guest accommodation.
Behaviour and Diet
The Streak-throated Hermit is diurnal and is usually encountered alone. Like other hermits, it may follow regular feeding routes and can defend favoured flowers or feeding areas, although detailed studies of its social behaviour are lacking.
Its diet consists mainly of nectar, supplemented by small arthropods such as insects and spiders. The long, curved bill allows it to exploit tubular flowers, while arthropods provide additional protein. It may hover briefly when feeding, but hermits also commonly perch between visits to flowers.
Males have been recorded singing and displaying from low perches in dense streamside or riverine vegetation. The song is a repeated, high-pitched phrase that may be delivered persistently from close to ground level. Breeding biology is poorly known, and there is not enough reliable information to retain precise claims about clutch size, incubation or nesting sites for this species.
As a nectar-feeding hummingbird, the Streak-throated Hermit may contribute to the pollination of plants that it visits. The importance of this role is likely to vary among habitats and plant species.
Identification Tips
- Look for a small hermit hummingbird with olive-green upperparts, muted greyish or buff underparts and a long, decurved bill.
- Check the throat for fine dark streaking or mottling, although the pattern may be subtle.
- Pale-tipped central tail feathers and a pale facial stripe can be useful supporting characters.
- Search shaded forest edges, river islands, várzea, gallery forest and dense secondary growth rather than open habitats.
- Listen for a persistent, high-pitched repeated song from a low perch.
- Distinguish it from other local hermits by combining throat pattern, tail shape, bill length, voice and habitat. Plumage alone can be unreliable in the dim understory.
Conservation Status
The Streak-throated Hermit is currently assessed as Least Concern on the IUCN Red List. Its total population has not been quantified, and its population trend is not well known. The species appears to be locally common in parts of its range but is poorly documented overall.
Potential threats include the loss and fragmentation of lowland forest, conversion of riverine vegetation to agriculture or pasture, logging and changes to river systems that affect forested islands and várzea habitat. Maintaining connected forest, riparian vegetation and native plant communities in protected areas is important for the species and for the wider bird community that uses these habitats.
Frequently Asked Questions
Where can the Streak-throated Hermit be found?
It occurs in northern South America, including eastern Colombia, Venezuela, western Guyana and northern Brazil. Its distribution includes lowland forests, river islands, várzea and gallery woodland.
Is the Streak-throated Hermit migratory?
It is generally considered resident rather than migratory. Local movements may occur in response to flowering conditions, water levels or changes in riverine vegetation.
What does the Streak-throated Hermit eat?
It feeds mainly on nectar and also takes small arthropods, including insects and spiders. Nectar supplies energy, while animal prey provides additional nutrients.
How can this hummingbird be identified?
Look for a small olive-green hermit with a long curved bill, muted underparts, streaked or mottled throat and pale-tipped central tail feathers. Its repeated high-pitched song can also help locate it.
Is the Streak-throated Hermit endangered?
No. It is currently classified as Least Concern, although habitat loss and degradation may cause local declines and its population trend has not been established reliably.
Where is the best place to see this species?
Anavilhanas National Park near Novo Airão in Amazonas, Brazil, is one of the best-documented viewing locations. Viruá National Park in Roraima and Canaima National Park in Venezuela also fall within documented parts of its range.
References
- IOC World Bird List
- IUCN Red List of Threatened Species
- Cornell Lab of Ornithology, Birds of the World
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