White-tailed Hummingbird

The White-tailed Hummingbird is easily recognizable by its distinct white tail feathers, which provide a stark contrast to its predominantly green body. The adult males exhibit a vibrant green plumage on their upperparts, while the underparts are a more muted grayish-white. This sexual dimorphism is less pronounced in females, who generally display a duller coloration overall. Juvenile White-tailed Hummingbirds resemble adult females but may show slightly more muted colors and less defined white tail markings until they mature. In flight, the bird's silhouette is typical of hummingbirds: a rapid wing beat and a small, streamlined body. However, its white tail is conspicuous even at a distance, aiding in identification. When perched, this species often holds its tail slightly spread, emphasizing the distinct white pattern. The White-tailed Hummingbird can be confused with other members of the Eupherusa genus, such as the Stripe-tailed Hummingbird, but careful observation of tail coloration will resolve such confusion. The bird's size, approximately 10-12 cm in length, also helps distinguish it from larger hummingbird species found in the same region.

The diet of the White-tailed Hummingbird primarily consists of nectar, which it sources from a variety of flowering plants native to its montane forest habitat. This nectar provides the high-energy fuel required for its rapid wing-beating and hovering flight. The hummingbird uses its specialized bill and tongue to access deep-tubed flowers, such as those from the Lobelia and Salvia genera. In addition to nectar, it supplements its diet with small insects and spiders, providing necessary proteins. Foraging activity peaks during dawn and late afternoon when flowers are most productive, but the bird can be active throughout the day. During the dry season, when floral availability may decrease, it may expand its foraging range or rely more heavily on available insects.

The White-tailed Hummingbird exhibits solitary behavior, typical of many hummingbird species. Males are territorial, often defending feeding territories vigorously against intruders, including other hummingbirds. These territories are typically centered around high-value food sources like large flowering bushes. Courtship involves elaborate aerial displays, where males demonstrate their agility and stamina. Such displays are critical to mating success. Although generally solitary, the White-tailed Hummingbird may tolerate others in areas with abundant resources. It maintains a daily rhythm of activity, with feeding primarily occurring during the cooler hours of the morning and late afternoon. In response to predators, such as hawks, the bird utilizes its agility to evade capture, often retreating into dense foliage for cover.

The White-tailed Hummingbird constructs a small, cup-shaped nest, typically located on a horizontal tree branch or in a bush at varying heights. The nest is meticulously crafted using plant fibers, lichen, and spider silk, which provides flexibility and strength. Females lay a clutch of two white eggs, which she incubates for approximately 15-18 days. The female alone assumes the responsibility for incubation and feeding of the chicks. Once hatched, the chicks remain in the nest for about 20-24 days before fledging. During this period, the female regularly feeds them with regurgitated nectar and insects. The species typically raises one to two broods per year, depending on environmental conditions and food availability.

The primary song of the White-tailed Hummingbird is a series of high-pitched, rapid notes that can be described as a metallic trill. These vocalizations are often heard during territorial displays or courtship. In addition to songs, the bird emits short, sharp call notes that serve as communication signals between individuals. Alarm calls are similar in tone but more urgent and are used to alert others of potential threats. During dawn, the bird may participate in a chorus, where multiple individuals sing intermittently as part of a territorial or courtship display.

• 1The White-tailed Hummingbird can beat its wings up to 70 times per second when hovering.
• 2Despite its small size, the White-tailed Hummingbird can travel at speeds exceeding 30 miles per hour.
• 3This species' heart rate can reach over 1,200 beats per minute during flight.
• 4White-tailed Hummingbirds can consume up to twice their body weight in nectar daily.
• 5The bird's white tail feathers provide a stark contrast against its green body, aiding in species identification.
• 6The hummingbird's ability to hover and fly backwards is unique among birds.
• 7White-tailed Hummingbirds are vital pollinators for many native plant species in their montane habitat.

The IUCN currently lists the White-tailed Hummingbird as Near Threatened, with habitat loss posing the most significant threat to its population. Deforestation for agriculture and urban development has fragmented its montane forest habitat. Despite these challenges, some conservation areas have been established within its range, aiming to preserve critical habitats. Continued efforts to protect and restore montane forests are essential for the species' long-term survival. Historical data indicate a gradual decline in population numbers, emphasizing the need for ongoing monitoring and habitat conservation initiatives.