The Blue-tailed Hummingbird (Amazilia cyanura) is a captivating species of hummingbird native to Central America, known for its striking iridescent plumage and distinctive blue tail feathers. It inhabits a variety of forested environments, from dry to moist tropical forests, and even adapts to heavily degraded habitats, showcasing remarkable ecological flexibility. This small but vibrant bird plays an important role in the pollination of many flowering plants throughout its range, contributing to the biodiversity and health of its native ecosystems.
Scientific Classification
The Blue-tailed Hummingbird belongs to the family Trochilidae, which encompasses all hummingbirds, a diverse group known for their rapid wing movement and hovering flight. The genus Amazilia includes a number of medium-sized hummingbird species primarily found in Central and South America. The species name cyanura refers to the characteristic blue coloration of its tail feathers, derived from the Greek words “kyanos” (blue) and “oura” (tail). First described by John Gould in 1859, the Blue-tailed Hummingbird is recognized scientifically as Amazilia cyanura. It is divided into three subspecies, each with subtle differences in distribution and plumage.
The three recognized subspecies are A. c. cyanura, the nominate race described by Gould, found in southern Honduras, eastern El Salvador, and northwestern Nicaragua; A. c. guatemalae, described by Dearborn in 1907, which ranges from southeastern Chiapas in Mexico to southern Guatemala; and A. c. impatiens, described by Bangs in 1906, found in northwestern and central Costa Rica. These subspecies reflect slight geographic and morphological variations but share the key defining characteristics of the species.
Geographic Range & Distribution
The Blue-tailed Hummingbird occupies a significant portion of Central America, extending from the southern Mexican state of Chiapas, through Guatemala, El Salvador, Honduras, Nicaragua, and down to Costa Rica. Its distribution is closely tied to subtropical and tropical forest habitats, where it thrives in both lowland and foothill regions. This species is typically found at elevations ranging from sea level up to approximately 1,500 meters (4,900 feet), although it is more commonly observed at lower elevations.
The species favors subtropical or tropical dry forests and moist lowland forests, but its adaptability allows it to inhabit heavily degraded former forests and secondary growth areas. This flexibility in habitat preference is a valuable trait in landscapes increasingly affected by human activity, such as deforestation and land conversion. However, the Blue-tailed Hummingbird tends to avoid dense primary forests and prefers somewhat open or semi-open habitats where flowering plants are abundant.
Within its range, the bird is generally common but localized, often seen in forest edges, gardens, plantations, and shrubby clearings. Its presence in agricultural and suburban areas, particularly in Costa Rica, allows birdwatchers and photographers to observe its striking colors relatively easily. Seasonal movements are not well-documented, suggesting that this species is largely sedentary, although some altitudinal movements may occur in response to changes in food availability.
Physical Description
The Blue-tailed Hummingbird is a small and elegant bird, measuring approximately 9 to 10 centimeters (3.5 to 4 inches) in total length, including its tail. It weighs roughly 4 grams (0.14 ounces), placing it within the average size range for hummingbirds of its genus. Its wingspan is estimated around 11 to 13 centimeters, enabling the rapid, precise wingbeats characteristic of hummingbirds.
Adult males display a shimmering green plumage on the head, back, and underparts, with a distinctive glittering green throat. The rump exhibits flashes of purple, providing a striking contrast to the surrounding green feathers. One of the most notable features is the deep blue coloration of the tail feathers, which gives the species its common name. The wings include cinnamon-colored patches at the base of the secondary flight feathers, a subtle detail that helps distinguish it from similar species. The bill is slender and predominantly black, but the lower mandible shows a bright red base, adding to the bird’s colorful appearance. White thigh tufts are visible during flight and perching.
Female Blue-tailed Hummingbirds are generally paler and less iridescent than males. Their throat feathers tend to be a softer green, and the underparts shift toward a greyish-buff tone. The cinnamon wing patch is reduced or sometimes absent in females, providing a useful field mark. Juvenile birds resemble females but have duller plumage overall, with a paler green throat and less distinct coloring on the wings and tail.
While the Blue-tailed Hummingbird shares some similarities with the Berylline Hummingbird (Amazilia beryllina), the latter has a cinnamon to coppery-colored tail rather than blue. Another species that can cause confusion is the Steely-vented Hummingbird (Amazilia saucerottei), which lacks the Blue-tailed Hummingbird’s distinctive rufous coloration on the wing’s secondary feathers.
Behavior & Diet
The Blue-tailed Hummingbird exhibits many of the energetic behaviors typical of hummingbirds, including rapid wingbeats, territorial defense, and high activity levels. It is a highly agile flyer, capable of hovering and performing quick darting movements as it forages. This species is known to be somewhat territorial, especially around feeding sites, where males may aggressively defend patches of flowering plants against rivals and other nectar feeders.
Its diet consists primarily of nectar drawn from a wide variety of small, brightly colored flowers found on trees, shrubs, herbs, and epiphytes. The bird favors flowers that are tubular and scented, which facilitate nectar feeding through its long, slender bill and extendable tongue. Preferred floral species often include members of the family Rubiaceae, Gesneriaceae, and Heliconiaceae, though the Blue-tailed Hummingbird is a generalist nectar feeder and utilizes many native plants depending on availability. According to Cornell Lab of Ornithology, this species is well documented.
In addition to nectar, the Blue-tailed Hummingbird supplements its diet with small arthropods such as spiders and insects, which provide essential proteins and nutrients. These are often captured in midair or gleaned from foliage and spider webs. This opportunistic feeding behavior is crucial during breeding and molting seasons when energy demands increase. According to Audubon Society, this species is well documented.
Breeding & Reproduction
The breeding biology of the Blue-tailed Hummingbird is consistent with many other hummingbirds but remains somewhat understudied in the wild. The breeding season varies geographically but generally coincides with the rainy season when floral resources are most abundant. Nests are typically constructed by the female alone, using soft plant fibers, spider silk, and lichens to create a small, cup-shaped structure often placed on horizontal branches or shrubs.
Clutches usually consist of two tiny white eggs, each measuring about 1 centimeter in length. Incubation is solely the female’s responsibility and lasts approximately 14 to 16 days. After hatching, the female continues to care for the nestlings, feeding them regurgitated nectar and small insects. Nestlings fledge after roughly three weeks, though fledging times can vary depending on environmental conditions and food availability.
During courtship, males display by fluttering their iridescent throat feathers and performing aerial maneuvers to attract females. Vocalizations are soft and high-pitched, consisting of a series of rapid chips and trills used to communicate territory boundaries and court potential mates.
Conservation Status
The Blue-tailed Hummingbird is currently classified as Least Concern by the International Union for Conservation of Nature (IUCN). Its relatively wide range and adaptability to various habitats, including secondary and degraded forests, help buffer the species against many threats affecting tropical birds. However, ongoing deforestation and habitat fragmentation in Central America pose potential risks to local populations.
Despite habitat loss in some areas, the species’ ability to utilize gardens and plantations with abundant flowering plants allows it to persist in human-modified landscapes. Conservation efforts focusing on preserving forested areas, promoting native plant gardens, and maintaining ecological corridors can support the long-term viability of Blue-tailed Hummingbird populations. Monitoring population trends remains important to detect any future declines potentially linked to environmental changes or increased land use pressures.
Interesting Facts
The Blue-tailed Hummingbird’s name is derived from its most striking feature: the brilliant blue coloration of its tail feathers, which shimmer in sunlight and are easily noticeable during flight. Though small in size, this bird is a powerhouse of energy, with wings that can beat up to 50 times per second, enabling sustained hovering and rapid maneuvers. This remarkable wing speed is supported by a high metabolism, which requires the bird to feed almost constantly during daylight hours.
One fascinating aspect of the Blue-tailed Hummingbird is its role in pollination. As it feeds on nectar, pollen grains stick to its head and bill, facilitating cross-pollination between flowers. This mutualistic relationship benefits both the bird, which gains nourishment, and the plants, which achieve reproductive success.
Another intriguing behavior is the use of white thigh tufts, which are thought to play a role in communication and mating displays. These tufts are especially visible during flight, adding to the bird’s visual signals. Additionally, the combination of green, purple, cinnamon, and blue plumage makes the Blue-tailed Hummingbird a favorite subject for wildlife photographers and birdwatchers exploring Central America.
Despite its vibrant colors and dynamic behavior, the Blue-tailed Hummingbird is relatively inconspicuous due to its small size and fast movements, requiring keen observation skills to spot in the wild. Its ability to adapt to a variety of habitats and its ecological importance as a pollinator make it a vital component of Central American biodiversity.
In summary, the Blue-tailed Hummingbird (Amazilia cyanura) is a small but remarkable bird that exemplifies the beauty and complexity of tropical ecosystems. Its iridescent plumage, specialized feeding behavior, and adaptability to changing environments highlight the marvels of avian evolution and ecology. As habitats continue to face pressure, understanding and appreciating species like the Blue-tailed Hummingbird is essential for fostering conservation and sustainable coexistence.
