Trochilus polytmus

Trochilus polytmus. Commonly known as the red-billed streamertail or doctor bird, it is a species of hummingbird endemic to the island of Jamaica. It is the national bird of Jamaica and is renowned for the male's extraordinarily long, streaming tail feathers. The species exhibits striking sexual dimorphism, with the iridescent green plumage and dramatic tail of the male contrasting with the more subdued, mostly white underparts of the female.

Description

The male is unmistakable, with iridescent emerald-green plumage on its head and back, a black crown, and a deeply forked tail where the two outer feathers are dramatically elongated into glossy black streamers that can exceed its body length. Its most distinctive feature is its bright red bill, which is slightly decurved, an adaptation for feeding on nectar from flowers like those of the Hibiscus and Heliconia. The female lacks the elongated tail streamers and is predominantly white below with green upperparts and white tips to the outer tail feathers, a pattern studied by ornithologists such as John Gould. Both sexes possess the rapid wing beats characteristic of the family Trochilidae, allowing for expert hovering flight.

Distribution and habitat

This species is found exclusively in Jamaica, where it is widespread across the island, though it is replaced in the extreme east by its close relative, the black-billed streamertail. It inhabits a variety of wooded habitats, from lush rainforests in the Cockpit Country and the Blue Mountains to gardens, plantations, and coastal scrub. Its presence is a common sight in the botanical gardens of Kingston and near the resort areas of Montego Bay, demonstrating its adaptability to human-altered landscapes. The species' range is entirely contained within the Caribbean biodiversity hotspot.

Behavior and ecology

The red-billed streamertail is primarily nectarivorous, using its specialized bill and long, extendable tongue to feed from a wide variety of flowering plants, playing a crucial role as a pollinator for many native species. It also consumes small insects and spiders for protein, often caught in mid-air during agile flights documented by naturalists like David Attenborough. Males are highly territorial, performing dramatic aerial displays and producing a loud humming with their wing feathers to defend prime feeding areas from rivals and other species like the Vervain hummingbird. Its vocalizations include sharp metallic "ting" calls.

Taxonomy and systematics

The species was first formally described by Carl Linnaeus in his landmark 1758 work Systema Naturae. For a long period, the black-billed population in eastern Jamaica was considered a subspecies, but it is now widely treated as a separate species, Trochilus scitulus, following detailed morphological and vocal analysis. The genus name *Trochilus* has historical roots in ancient Greek literature, while the specific epithet *polytmus* derives from Greek, referencing its "much-prized" or valuable nature. Its classification within the hummingbird family continues to be refined through modern genetic studies involving institutions like the Smithsonian Institution.

Relationship with humans

Deeply embedded in Jamaican culture, the streamertail is celebrated as the national bird and features prominently on the Order of the Nation and the Jamaican dollar. Its local name, "doctor bird," is steeped in Jamaican folklore, often associated with healing and spiritual wisdom. The bird is a major ecotourism draw, with birdwatchers from organizations like the American Birding Association traveling to Jamaica specifically to observe it. While currently listed as Least Concern by the International Union for Conservation of Nature, its dependence on native flora means habitat preservation in areas like the Blue and John Crow Mountains National Park remains vital for its long-term survival.

Category:Trochilus Category:Birds of Jamaica Category:National symbols of Jamaica Category:Birds described in 1758