Western Emerald
Chlorostilbon melanorhynchus
Order: Apodiformes / Family: Trochilidae
About the Western Emerald
The Western Emerald, scientifically known as Chlorostilbon melanorhynchus, is a small yet striking member of the family Trochilidae, which includes all hummingbirds. This species is native to parts of South America, predominantly inhabiting the Andean foothills of Colombia and Ecuador. Unlike many hummingbirds, the Western Emerald is primarily non-migratory, residing in its preferred habitats year-round. Its vivid green plumage shimmers in sunlight, making it a captivating sight for birdwatchers and naturalists alike. The bird plays a crucial ecological role as a pollinator, transferring pollen as it feeds on the nectar of various flowering plants. Its presence in diverse habitats, from subtropical montane forests to scrublands, highlights its adaptability and ecological significance. Seasonal behaviors of the Western Emerald are tied closely to the flowering cycles of its preferred plants. During the rainy season, when flowers abound, these hummingbirds exhibit increased activity, aggressively defending feeding territories. In contrast, during drier periods, they may expand their range slightly in search of food, although they generally remain within a fixed home range. The species' ecological role extends beyond pollination, as it also preys on insects, thus contributing to natural pest control. The Western Emerald's resilience and adaptability to changing environmental conditions underscore its importance within the ecosystems it inhabits. The bird's vibrant presence enriches the biodiversity of the regions it calls home, making it a species of interest for both conservationists and ecotourists.
The Western Emerald belongs to the family Trochilidae, within the order Apodiformes. These birds typically live average 4-5 years, with a maximum recorded of 8 years..
How to Identify a Western Emerald
The Western Emerald exhibits a dazzling plumage that serves as a key identifier. Adult males display a metallic green body with a slightly darker, glossy crown and tail. Females, although similar in hue, have a more subdued green with a whitish underbelly, providing a subtle contrast to the males' brilliance. Juveniles resemble females but lack the refined metallic sheen, appearing somewhat duller. Both genders possess a straight, slender bill, distinguishing them from similar species like the Sparkling Violetear, which has a distinctly curved bill. In flight, the Western Emerald's silhouette is characterized by rapid, darting movements, facilitated by its short wings and tail. Perched, this hummingbird maintains an upright posture, often holding its tail slightly fanned. The bird's iridescent plumage can sometimes lead to confusion with other emerald species, but its size and specific hue help in identification. Notably smaller than many hummingbirds, the Western Emerald's compact form and brilliant green are reliable field marks.
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Western Emerald Habitat and Range
Preferred Habitat
The Western Emerald thrives in a variety of habitats, predominantly favoring subtropical and tropical moist montane forests. It can also be found in semi-open areas, such as forest edges and clearings, where flowering plants abound. Elevation plays a critical role in its habitat preference, with sightings most common between 1,000 and 2,500 meters above sea level. During different seasons, these hummingbirds may shift slightly within this range to optimize access to food sources. Interestingly, the Western Emerald is occasionally observed in urban gardens, particularly those that provide a rich array of nectar-producing flowers. Its adaptability to both natural and altered landscapes attests to its resilience.
Geographic Range
The Western Emerald inhabits a relatively restricted range within Northwestern South America. Its primary distribution includes the Andean regions of Colombia and Ecuador, where it resides year-round. Unlike many migratory hummingbirds, this species does not undertake long-distance migrations, remaining within its established range. However, local movements in response to food availability are common, especially in areas where seasonal changes affect floral abundance. Population density is highest in biodiverse hotspots, such as the cloud forests of the Colombian Andes, where the bird benefits from a rich assemblage of flowering plants. Despite its limited range, the Western Emerald's presence is well-documented in these regions, indicating a stable population.
Want to know which birds visit your area? Browse our backyard birds by location guides for region-specific species lists.
What Does the Western Emerald Eat?
The Western Emerald's diet centers around nectar from a variety of flowering plants, including bromeliads and ericaceous shrubs. These birds forage by hovering in front of flowers, using their specialized bills and long tongues to extract nectar. In addition to nectar, they consume small insects and spiders, which provide essential proteins and nutrients. The diet shifts slightly with the seasons, as the availability of flowering plants changes. During periods of nectar scarcity, the Western Emerald may increase its intake of insects. Foraging occurs throughout the day, with peak activity during early morning and late afternoon when floral nectar is most abundant.
Want to attract Western Emeralds to your yard? See our recommended feeders and seed types for the best results.
Western Emerald Behavior and Social Structure
Western Emeralds exhibit solitary behavior, with each individual aggressively defending its feeding territory. Territorial disputes are common, characterized by rapid chases and vocalizations. During the breeding season, males perform elaborate courtship displays, including aerial maneuvers and vocalizations to attract females. Despite their solitary nature, these hummingbirds occasionally form loose aggregations around abundant food sources. In response to predators, such as raptors or snakes, the Western Emerald relies on its agility and speed, quickly retreating to dense foliage. Its daily activities include periods of intense foraging interspersed with rest and preening sessions.
Western Emerald Nesting and Reproduction
The Western Emerald constructs a small, cup-shaped nest using plant fibers, moss, and spider silk. These nests are often situated on horizontal branches, typically 1 to 3 meters above the ground. Females lay two white eggs per clutch. The incubation period spans approximately 15 to 18 days, during which the female alone incubates the eggs. After hatching, the nestlings remain under the female's care until they fledge at around 20 to 25 days old. The Western Emerald may produce two broods per year, depending on environmental conditions and food availability.
Western Emerald Sounds and Vocalizations
The vocalizations of the Western Emerald are relatively simple, consisting of high-pitched, rapid 'tsee-tsee' notes. These calls serve various purposes, including territorial defense and communication between mates. Alarm calls are sharper and more insistent, alerting nearby birds to potential threats. During the dawn chorus, Western Emeralds contribute with intermittent trills that add to the symphony of morning sounds in their habitat.
Interesting Facts About the Western Emerald
- 1The Western Emerald is capable of beating its wings up to 80 times per second, a feat that allows it to hover like a helicopter.
- 2Despite its small size, the Western Emerald can cover large distances in search of nectar, traveling up to 20 kilometers in a day.
- 3The iridescence of the Western Emerald's plumage is due to microscopic platelets in the feathers that refract light.
- 4Western Emeralds can enter a state of torpor, a temporary hibernation-like condition, to conserve energy during cold nights.
- 5These hummingbirds have extraordinary memories, allowing them to remember the locations of individual flowers within their territory.
- 6The Western Emerald's tongue is specially adapted, capable of extending beyond its bill to reach deep into flowers for nectar.
- 7Unlike many birds, the Western Emerald can see ultraviolet light, helping it locate flowers with hidden nectar guides.
Western Emerald Conservation Status
Currently, the Western Emerald is classified as Least Concern by the IUCN, with a population trend that appears stable. Primary threats include habitat loss due to deforestation and agricultural expansion. Conservation efforts focus on preserving natural habitats and promoting sustainable land-use practices. Historically, the species has maintained a stable population across its range, benefiting from conservation initiatives in Colombia and Ecuador.
Attracting Western Emeralds to Your Feeder
The Western Emerald is a regular visitor to backyard bird feeders across its range. At the Eye On The Fly feeding station, we observe Western Emeralds regularly and capture footage with our feeder cameras.
