Introduction
The Esmeraldas Woodstar (Chaetocercus berlepschi) is a tiny hummingbird endemic to western Ecuador. It is restricted to fragmented lowland and foothill forests on the Pacific slope, where it is local and often difficult to find. Although small, it is an important nectar-feeder and pollinator within the remaining coastal forests.
Physical Description
The Esmeraldas Woodstar is approximately 6.5 cm long. It has a short, straight, black bill and the compact body shape typical of woodstars.
Adult males have shining green upperparts, mainly white underparts, a white stripe behind the eye, a green breast band and a brilliant violet-purple gorget. The tail is forked. Adult females are less brightly coloured, with green upperparts, a white postocular stripe and mostly buff or pale cinnamon underparts. Their tail is mainly cinnamon with a dark subterminal band, while the central feathers are green.
Juvenile males can resemble adult females. They usually have pale underparts, a buff-tinged throat with few or no visible purple gorget feathers, and a distinctive rounded tail with cinnamon and pale-tipped outer feathers. This age-related plumage formerly caused some juvenile males to be incorrectly identified as females.
Range and Habitat
The Esmeraldas Woodstar is endemic to Ecuador. Confirmed records come from parts of Esmeraldas, Manabí and Guayas provinces, particularly in the coastal lowlands and foothills of western Ecuador. The species has a small, highly fragmented distribution, and many former forest areas have been cleared or degraded.
It favours lowland and foothill moist forest, including semi-evergreen and semi-deciduous forest, as well as humid forest in the Chongón-Colonche hills. It is most often associated with relatively intact forest, but has also been recorded in suitable secondary growth and partially open areas, especially during the breeding season. Most documented records are from low elevations, generally below 500 metres, although occasional movements to higher sites have been reported.
The species appears to be seasonal in parts of the Chongón-Colonche region. Birds have been recorded there mainly from about November to April, while the non-breeding distribution is less well known. Records from Esmeraldas Province suggest that some birds may move north after the breeding period, but the extent and regularity of these movements remain uncertain.
Where to See This Species
Río Ayampe Reserve, Manabí, Ecuador
The Río Ayampe area is one of the best-known localities for the Esmeraldas Woodstar. The reserve protects humid forest and regenerating habitat in the Ayampe drainage, close to the southern edge of the species’ documented breeding range. The woodstar has been recorded there during the wetter breeding period, particularly from approximately November to April. Visits should be arranged locally, and sightings are not guaranteed because the species is scarce and highly localised.
Nearby accommodation: Ayampe and Las Tunas provide guest houses, small hotels, lodges and self-catering accommodation, with additional services in Puerto López.
Loma Alta Communal Ecological Reserve, Santa Elena, Ecuador
Loma Alta protects forest and garúa habitat in the Chongón-Colonche range. The Esmeraldas Woodstar has been recorded in the reserve, including in humid forest associated with flowering understorey plants. The species is most likely to be encountered in suitable forest during the local breeding season, although its presence can vary between years.
Nearby accommodation: The community of Loma Alta and the wider Colonche area offer basic guest-house and community accommodation, while Santa Elena and Montañita provide a broader choice of hotels and self-catering stays.
Machalilla National Park, Manabí, Ecuador
The Esmeraldas Woodstar has been recorded in the lower Ayampe drainage near the southern boundary of Machalilla National Park. Visitors should concentrate on moist forest, forest edges and flowering vegetation in the Ayampe sector rather than assuming that the species occurs throughout the park. Local guidance is advisable because access and recent sightings vary between sites and seasons.
Nearby accommodation: Puerto López is the principal gateway, with hotels, guest houses, lodges and self-catering accommodation.
Behaviour and Diet
The Esmeraldas Woodstar feeds mainly on nectar from flowering plants. It also takes small insects and spiders, which provide protein and other nutrients. In the Chongón-Colonche hills, individuals have been observed visiting flowering plants including Kohleria, Cornutia, Psychotria and Razisea.
Like other hummingbirds, it can hover while feeding and manoeuvre rapidly through dense vegetation. Males may defend feeding territories or favoured perches and display around flowering plants. The species is generally solitary outside breeding interactions.
Breeding activity has been documented during the wetter months, broadly from October or November to April. Researchers have recorded courtship, copulation and numerous small nests in western Ecuador. The female builds and attends the nest, but several aspects of incubation, fledging and post-breeding movements remain poorly known.
Identification Tips
- Look for a very small woodstar with a short black bill and rapid, precise hovering flight.
- An adult male shows a bright violet-purple gorget, green upperparts, white underparts, a white stripe behind the eye and a green breast band.
- An adult female is more subdued, with buff or pale cinnamon underparts and a cinnamon tail marked by a dark subterminal band.
- Do not automatically identify a pale bird as a female. Juvenile males can have white underparts, a buff throat and little visible purple on the throat.
- The species can be confused with other small woodstars, especially the Little Woodstar and White-bellied Woodstar in areas of overlap. Size, tail pattern, the colour and shape of the gorget, and the extent of the white or buff underparts should be assessed together. Females and immature birds can be particularly difficult to identify in the field.
Conservation Status
The Esmeraldas Woodstar is currently assessed as Vulnerable on the IUCN Red List. Older publications sometimes referred to it as Endangered, reflecting earlier assessments and the limited information then available.
The principal threats are the loss and fragmentation of western Ecuador’s coastal forests through agricultural clearance, logging, settlement expansion and livestock grazing. Forest fires and the degradation of understorey vegetation can further reduce feeding and nesting habitat. The species’ restricted distribution and seasonal movements make it vulnerable to the continued loss of suitable habitat.
Important conservation measures include protecting remaining forest, maintaining habitat corridors, restoring degraded areas, safeguarding flowering plants and improving knowledge of the non-breeding range. Community conservation reserves, including Río Ayampe and Loma Alta, are particularly important because they protect habitat in parts of the species’ known range while supporting local conservation initiatives.
Frequently Asked Questions
Where is the Esmeraldas Woodstar found?
It is endemic to western Ecuador, with confirmed records from parts of Esmeraldas, Manabí and Guayas provinces. Its distribution is small and fragmented, mainly in lowland and foothill forest on the Pacific slope.
What does the Esmeraldas Woodstar look like?
It is a hummingbird about 6.5 cm long. The male has green upperparts, white underparts and a bright violet-purple throat, while the female has more subdued green and buff or cinnamon plumage.
Is the Esmeraldas Woodstar endangered?
The species is currently listed as Vulnerable by the IUCN. Its main conservation problems are habitat loss, forest fragmentation, livestock pressure, agricultural clearance and other forms of forest degradation.
What does the Esmeraldas Woodstar eat?
It feeds mainly on nectar from flowering plants and also captures small insects and spiders. Males may defend productive flowering patches or feeding territories.
When is the best time to look for this species?
In the Chongón-Colonche region, most records come from roughly November to April, the wetter breeding period. The species’ movements outside this period are not fully understood, so local guidance and recent records are valuable.
Where are good places to look for the Esmeraldas Woodstar?
The Río Ayampe Reserve, Loma Alta Communal Ecological Reserve and the Ayampe sector near Machalilla National Park are documented localities. The bird is scarce, so suitable habitat and recent local information are more important than simply visiting an area within its broad range.
References
- IUCN Red List of Threatened Species
- IOC World Bird List
- The Wilson Journal of Ornithology, Harris, Ágreda, Juiña and Freymann, 2009
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