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6 Fascinating Facts About the Blue-throated Hillstar

The Blue-throated Hillstar, scientifically known as Oreotrochilus cyanolaemus is a beautiful bird species found in the Andes mountains of South America. These spectacular birds are considered to be one of the smallest species of hummingbirds and are a great representative of their ecosystem.


Identifying this bird species isn’t always straightforward, and it requires an expert eye to discern their features from a distance. The male has bright blue feathers on their throat, which is a signature feature of this bird species.

The rest of their body is a dull brown color, giving the bird a unique appearance. Females, on the other hand, have a dull gray-brown color, with no signs of bright blue.



The Blue-throated Hillstar is commonly found in high-altitude areas, especially in the rocky regions of the Andes. They prefer to live in areas with grass, scrub, and low bushes, making it easier for them to hide and search for food.

Similar Species

The Blue-throated Hillstar shares some features with other hummingbird species, making identification a little tricky. The Amethyst-throated Sunangel and the Shining Sunbeam, among others, are in close resemblance.

The major difference between these species is their habitat, calls, and the different shades of blue on their body.


The Blue-throated Hillstar has a unique molt, where the male loses their blue feathers during the breeding season and then regains them after the season. The transformation for these hummingbirds is truly a remarkable event to see.


The molting process starts after the breeding season when the male’s blue feathers slowly start to disappear. This is caused by a reduction in feather pigmentations that eventually fades as each month passes.

The male replaces their dull, brown feathers with new colorful ones inSeptember, just in time for the upcoming breeding season. Notably, during the winter season, the male birds migrate to lower altitudes.

This prevents them from hypothermia during the cold season. The females, on the other hand, stay behind or fly to nearby areas during the winter period.

In conclusion, the Blue-throated Hillstar bird is a magnificent species that offers great aesthetic pleasure to bird-watchers and ornithologists alike. Their unique features make them stand out from other species, and their distinct blue throat is easily recognizable.

Though challenging to identify, they are a great representation of their ecosystem and are a beautiful sight to behold.

Systematics History

The Blue-throated Hillstar is a member of the Trochilidae family, also known as hummingbirds. In recent years, the classification of this specific hummingbird species has been a point of interest for many ornithologists.

Genetic and morphological data suggest that the Blue-throated Hillstar is more closely related to the Oreotrochilus group than the other species of Hillstar.

Geographic Variation

The Blue-throated Hillstar is a bird species that is endemic to the Andes of South America. The Andes is a high-altitude region stretching from Venezuela in the north to Chile and Argentina in the south.

Interestingly, the Blue-throated Hillstar has a restricted range within the Central Andes, where they are commonly observed in Ecuador and Peru.


The Blue-throated Hillstar has several subspecies, each with different physical attributes that allow them to survive and thrive within their specific habitat. Currently, there are four recognized subspecies of the Blue-throated Hillstar:


Oreotrochilus cyanolaemus cyanolaemus, found in central Peru. 2.

Oreotrochilus cyanolaemus sapphiropygius, found in southern Peru. 3.

Oreotrochilus cyanolaemus violicollis, found in northern Ecuador. 4.

Oreotrochilus cyanolaemus huancabambae, found in central Ecuador. The subspecies have distinct variations in their plumage, where different colors, proportions, and patterns allow the birds to adapt to their unique environments.

Related Species

The Blue-throated Hillstar is a member of the Oreotrochilus genus, which has seven species with overlapping ranges. Ornithologists have suggested that the Blue-throated Hillstar is more closely related to the Oreotrochilus group, which includes the Andean Hillstar, the White-bellied Hillstar, and the Chestnut-breasted Coronet.

These species are visually similar and share the same ecological niche.

Historical Changes to Distribution

The Blue-throated Hillstar has faced several historical changes to its range and distribution. As with many species that live within restricted ranges, the Blue-throated Hillstar has faced habitat loss and fragmentation caused by rapid agricultural expansion, mineral and oil extraction, urban development, and deforestation.

This has caused a significant decline in the population, where the International Union for Conservation of Nature (IUCN) has classified them as “Critically Endangered”. The IUCN warns that without effective conservation measures, this bird species could face extinction.

Fortunately, the Blue-throated Hillstar has proven to be resilient in the face of habitat loss and fragmentation. They have shown the capability to adapt to disturbed habitats and urban environments, where sightings of individuals within the vicinity of cities have become more frequent.

Conservation efforts have been put in place to protect the species and reduce the pressure on their habitats. These efforts include habitat restoration, the creation of protected areas, and the establishment of corridors to connect isolated populations.

In conclusion, the Blue-throated Hillstar is an Andean bird species with a restricted range that has shown remarkable adaptation to changes in their environment. With the help of effective conservation measures, the population of these birds has the potential to recover.

The understanding of their systematics history, geographic variation, subspecies, and related species is essential to conserve this beautiful bird species for future generations to come.


The Blue-throated Hillstar is a bird species that is uniquely adapted to the high-altitude areas in the Andes Mountains. These birds prefer to live in rocky areas with low vegetation, such as scrub, grass, and bushes, where they can find shelter and food.

Their natural habitat ranges from 3,200 to 4,500 meters above sea level. The environment in which they live is characterized by cold temperatures, unpredictable weather patterns, and low oxygen levels.

The Blue-throated Hillstar’s natural habitat is under threat as a result of human activities. The expansion of agricultural activities, such as mining and livestock farming, have led to habitat fragmentation and destruction, leading to a decline in the population of the Blue-throated Hillstar.

Movements and Migration

The Blue-throated Hillstar is known to move within their local habitat, but there is no evidence to suggest that they make long-distance movements that are typical of migratory birds. They are a resident species in the Andes and occupy their natural habitat throughout the year.

However, it has been observed that they move to lower elevations during the non-breeding season, probably due to the cold temperatures associated with the high-altitude Andes environment. During the breeding season, males defend a territory and display their vibrant blue throat feathers to attract a female mate.

Females build their nests in rock crevices and ledges, and can lay up to two white eggs. The incubation period is approximately 16 days, and the young are ready to fledge within 18-22 days.

In recent years, the impact of climate change has raised concerns about the impact on the Blue-throated Hillstar’s breeding behavior and reproductive success. Studies have shown that warmer temperatures have caused plant and insect phenology changes, leading to a decline in food availability.

This change has a direct impact on the ability of the Blue-throated Hillstar to breed and raise their young. Conservation efforts have been put in place to protect the Blue-throated Hillstar and their habitat.

Protected areas have been established to safeguard the birds, and conservationists are working to restore damaged habitats. In addition, awareness campaigns have been launched to educate local communities on the importance of the Blue-throated Hillstar’s conservation and the impact of environmental degradation on their existence.

In conclusion, the Blue-throated Hillstar is a unique bird species that is adapted to the harsh environments in the high-altitude areas of the Andes. The birds are residents in their habitat throughout the year, but they move to lower elevations during the non-breeding season.

Their habitat is under threat due to human activities, but conservation efforts are being put in place to safeguard the birds and their habitat. The impact of climate change on the Blue-throated Hillstar is a growing concern, and there is a need for effective conservation measures to protect this beautiful bird species.

Diet and Foraging

The Blue-throated Hillstar has a unique diet and feeding behavior, as is the case with most hummingbird species due to their small size and high metabolic rates.


These birds have a high metabolism, which means that they require lots of energy to maintain their body heat and remain active. They meet these high-energy demands by consuming nectar, insects, and pollen.

The Blue-throated Hillstar is known to feed on nectar from flowers with tubular shapes, which they reach with their long, thin bills. To obtain nectar, they hover in front of flowers, inserting their beaks deep into the flower tube to reach the nectar.

They have a long, extendable tongue that allows them to extract nectar more efficiently.


In addition to nectar, the Blue-throated Hillstar is known to feed on small insects and spiders, which provide the protein that they need to build and maintain their bodies. They catch the insects in mid-air or pluck them from leaves or bark, using their sharp, thin bills and quick reflexes.

Metabolism and Temperature Regulation

The Blue-throated Hillstar has a high metabolism, which means that they have a higher body temperature than most birds, allowing them to remain active in the colder Andean environment. They also have a higher heart rate, which they use to circulate oxygen to their muscles.

This unique adaptation is what allows the Blue-throated Hillstar to remain active and fly in the high-altitude environment of the Andes, where air is thin and oxygen levels are low.

Sounds and Vocal


The Blue-throated Hillstar has a unique vocalization, which is essential for communication, territory defense, and mate attraction.


The Blue-throated Hillstar’s vocalization is high-pitched and often trilling or buzzing. The male is known to make a rapid series of high-pitched staccato notes followed by a buzzy trill.

These songs are used to attract a mate, and females are known to respond to the male’s songs with shorter, more subdued calls. During the breeding season, males are known to defend their territory aggressively, using their vocalizations as one of their primary defense mechanisms.

The aggressive, high-pitched calls of the Blue-throated Hillstar make them a distinctive and easily-recognizable bird species in their native Andean habitat. In conclusion, the Blue-throated Hillstar has unique feeding behavior and a high metabolism, which enables them to survive in the harsh environments of the Andes.

Their diet of nectar, insects, and pollen, coupled with their high energy demands, supports their active lifestyle. The Blue-throated Hillstar’s vocalization is high-pitched, trilling, and buzzing, which is essential for communication, territory defense, and mate attraction.

Understanding the importance of their diet and vocalization behaviors is crucial for bird enthusiasts, conservationists, and researchers alike.


The Blue-throated Hillstar is an interesting bird species that engages in different types of behavior to survive and maintain their populations.


The Blue-throated Hillstar has a unique locomotion pattern, these birds hover during flight, and they use their long, thin bills to capture insects and extract nectar. They have well-developed muscles that allow them to flap their wings incredibly fast, which enables them to stay aloft for extended periods.

When the birds are not in flight, they hop and walk on their legs, which are adapted to cling to rough surfaces.

Self Maintenance

The Blue-throated Hillstar takes extensive care of its feathers, preening them with their bills to keep them clean, smooth, and well-organized. Preening is crucial for the bird’s survival, as it helps to maintain insulation and streamline their bodies for more efficient flight.



The Blue-throated Hillstar is known for its agonistic behavior, which includes aggressive behavior towards competitors for nectar or other resources. The males defend their territory during the breeding season, chasing away other males and intruders that may pose a threat to their mate.



During the breeding season, the Blue-throated Hillstar displays unique sexual behavior, where the males have bright blue feathers on their throat, which they use to attract a mate. The males engage in courtship displays, including hovering in front of the female and displaying their blue feathers while trilling.

These displays allow them to show off their physical fitness and readiness to breed.


The breeding season for the Blue-throated Hillstar is from January to June, where the males establish territories and defend them aggressively. The female lays one or two white eggs in a nest made of dry grass and moss, which they build on a rock ledge or crevice.

The incubation period takes around 16 days, and both parents take turns to incubate the eggs. The young are born without feathers, and their eyes are closed, but they develop quickly and fledge within 18-22 days.

Demography and Populations

The Blue-throated Hillstar is classified as a “Critically Endangered” species by the International Union for Conservation of Nature because of its restricted range, habitat loss, and low population size. The populations of the Blue-throated Hillstar have declined significantly due to human activities, including mining, logging, agricultural expansion, and urbanization.

Conservation efforts have been put in place to safeguard the Blue-throated Hillstar and their habitat, but much still needs to be done to ensure their survival. In conclusion, the Blue-throated Hillstar has unique behavior and reproductive strategies, which are essential to its survival in the harsh Andean environment.

Conservation efforts play a crucial role in safeguarding their habitat and populations, but it is vital for individuals and communities to take an active role to protect these remarkable birds. In summary, the Blue-throated Hillstar is a unique and remarkable bird species found only in the high-altitude environments of the Andes mountains.

Its thriving populations provide an essential ecological balance, playing a considerable role in the pollination and maintenance of their ecosystem. Understanding the systematics history, geographic variation, diet, vocalization, behavior, and demography of the Blue-throated Hillstar provides crucial insights into their protection and conservation.

Every individual’s conservation efforts can make a substantial difference in ensuring that this beautiful bird species thrives for generations to come. It is thus crucial for all to work together to protect the habitats of the Blue-throated Hillstar and other endangered species to maintain an ecological balance in the environment.

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