Sword-billed hummingbird

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Sword-billed hummingbird
Male
Female sword-billed hummingbird (right) with a buff-tailed coronet
Call

Least Concern  (IUCN 3.1)[1]
CITES Appendix II (CITES)[2]
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Clade: Strisores
Order: Apodiformes
Family: Trochilidae
Tribe: Heliantheini
Genus: Ensifera
Lesson
, 1843
Species:
E. ensifera
Binomial name
Ensifera ensifera
(Boissonneau, 1840)
Distribution range of the sword-billed hummingbird
Synonyms

Ornismya ensifera Boissonneau, 1840

The sword-billed hummingbird (Ensifera ensifera), also known as the swordbill, is a

preen
using their bills, the sword-billed hummingbird uses its feet to scratch and preen due to its bill being so long.

The sword-billed hummingbird is a

cup nests using moss. The sword-billed hummingbird is listed as being of least concern by the International Union for Conservation of Nature (IUCN) on the IUCN Red List, but is threatened by climate change and deforestation
.

Taxonomy and systematics

The sword-billed hummingbird was first

Bogotá, Colombia.[3] It was moved to the genus Ensifera in 1843 by René Lesson.[4] The generic and specific name ensifera is derived from the Latin words ensis (sword) and ferre (to carry) and means sword-wielder, referring to the species' large beak.[5] Sword-billed hummingbird is the official common name designated by the International Ornithologists' Union.[6] Other common names for the species include sword billed hummingbird, swordbill, and swordbill hummingbird.[7][8]

The sword-billed hummingbird is the

nominate subspecies as it is likely that the specimen had either aberrant plumage or was discolored. The species is now considered monotypic.[10]

Description

Male sword-billed hummingbird in Caldas, Colombia

The sword-billed hummingbird is among the largest species of hummingbirds. Adults are 13–14 centimetres (5.1–5.5 in) long excluding the bill and weigh 10–15 g (0.35–0.53 oz), with males being slightly larger on average than females.[11] The most distinctive feature of the species is the enormous bill, which is 8–12 centimetres (3.1–4.7 in) long.[12] The bill is the largest of any hummingbird and the largest with respect to body length for any bird.[10]

The sword-billed hummingbird displays

underparts, a dark gray belly, and a forked blackish bronze-green tail. Some males have white on the chin and throat. Females have similar upperparts, but have white underparts and grayish throats and bellies speckled with green. The tail is less deeply forked and is edged grayish white. Juveniles look similar to females.[10][11]

The sword-billed hummingbird is the only known bird whose bill is longer than the rest of the body, excluding the tail.

corollas that are inaccessible to other species.[12]

Vocalizations

The sword-billed hummingbird makes a low, guttural, slightly trilled trrr.[10][11]

Habitat and distribution

The sword-billed hummingbird is found in the

non-migratory, but shows localized movements in Colombia and northwestern Venezuela, where it moves to higher altitudes in the early wet season and returns to lower elevations in the dry season.[10][11]

The sword-billed hummingbird's distribution correlates with the distribution of species of the subgenus Tacsonia in the genus Passiflora, due to its highly specialized bill and feeding habits.[12][15]

Behavior and ecology

As is characteristic of hummingbirds, the sword-billed hummingbird can fly backwards and hover in the air.[16] It also exhibits higher than average wing-disk loading than other members of its family.[17]

Diet and feeding

Female sword-billed hummingbird feeding in flight

The sword-billed hummingbird is a

P. mollissima and P. sexflora, along with flowers from the genera Aethanthus, Fuchsia, Salpichroa, and Solanum. It probes flowers from below while feeding, and is a trap-line feeder, visiting a specific series of flowers in a regular, consistent sequence. It also hawks for insects, catching flying insects by keeping the bill open.[10]

Perching and preening

The sword-billed hummingbird perches with its bill angled upwards to reduce the strain of the heavy beak and improve balance.

ectoparasites and spread oil across the feathers.[18]

Reproduction

Breeding occurs from February to March. Nests are

cup-shaped and made of moss, and are usually hung among root fibers high above the ground.[11]

Co-evolution with Passiflora mixta

The long corolla of Passiflora mixta is coevolved with the bird's bill as a pollination strategy.

The sword-billed hummingbird displays extreme

corolla tube, make it an inaccessible food source to nearly every species except the sword-billed hummingbird. This mutualistic relationship lets P. mixta depend on the bird for pollination, while the bird obtains a high-quality food source.[19] To obtain nectar, the hummingbird will stick its long bill down the tube of the corolla (both of which are almost exactly the same length), drink, and then retreat and hover for a few seconds before repeating the process. Other species, such as insects, may be able to access the flower's nectar but do so by puncturing the base and feeding through a hole instead of the corolla tube. Additional evidence of coevolution is that both species also inhabit the same territory range along the Andean mountains. If sword-billed hummingbird populations were to decline, there would most likely be a negative impact on the abundance of P. mixta flowers due to their extreme coevolution.[15]

Status and conservation

The sword-billed hummingbird is listed as being of least concern by the International Union for Conservation of Nature (IUCN) on the IUCN Red List due to its large range, lack of significant population decline, and lack of major threats. There is also no census on global number of individuals, because of the large range of occurrence and uncommon sightings.[14] It has adapted to man-made habitats in some areas and is also known to occur in several protected areas.[10] Climate change and deforestation are the two most probable threats to the sword-billed hummingbird as they may lead to habitat loss and a decrease in food sources, especially of Passiflora mixta.[19]

In art and media

The BBC's documentary series Planet Earth II depicted the sword-billed hummingbird flying through the forest in the episode "Jungles".[13]

References

  1. . Retrieved 12 November 2021.
  2. ^ "Appendices | CITES". cites.org. Retrieved 2022-01-14.
  3. ^ Société Cuvierienne; Cuvierienne, Société (1839). Revue zoologique. Vol. 2. Paris: Société cuvierienne.
  4. ^ Cottrell, G. William; Greenway, James C.; Mayr, Ernst; Paynter, Raymond A.; Peters, James Lee; Traylor, Melvin A.; University, Harvard (1945). Check-list of birds of the world. Vol. 5. Cambridge: Harvard University Press.
  5. .
  6. ^ "Hummingbirds – IOC World Bird List". Retrieved 2021-10-09.
  7. ^ "Ensifera ensifera (Sword-billed Hummingbird) - Avibase". avibase.bsc-eoc.org. Retrieved 2021-10-09.
  8. ^ "Definition of SWORDBILL". www.merriam-webster.com. Retrieved 2021-10-09.
  9. .
  10. ^ , retrieved 2021-10-09
  11. ^ .
  12. ^ .
  13. ^ a b "Sword-billed hummingbirds are the only birds in the world to have beaks longer than their bodies. - In pictures... Jungles". Planet Earth II. BBC One. Retrieved 2017-10-15.
  14. ^ .
  15. ^ .
  16. .
  17. ^ Snow, David (1980). Relationships between hummingbirds and flowers in the Andes of Colombia. British Museum: Bulletin of the British Museum.
  18. S2CID 53184717
    .
  19. ^ .

External links