Lesser violetear

Lesser violetear
Not recognized (IUCN 3.1)
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Apodiformes
Family: Trochilidae
Genus: Colibri
Species: C. cyanotus
Binomial name
Colibri cyanotus
(Bourcier, 1843)
Subspecies

See text

The lesser violetear (Colibri cyanotus) is a medium-sized, metallic green hummingbird species commonly found in forested areas from Costa Rica to northern South America. This species and the Mexican violetear were conspecific and together called the green violetear.

Male displaying his "ears"

Taxonomy

At a feeder in Savegre, Costa Rica

The green violetear belongs to the order Apodiformes. Hummingbirds share this order with the swifts, such as the white-collared swift. The name Apodiformes is derived from the Greek words "a pous," meaning "without foot." While apodiforms do in fact have feet, they are quite small and their legs are short and relatively weak. Many birds in this order cannot walk, and thus rarely if ever land on the ground since quick escape from predators is virtually impossible. For this reason members of this order spend a majority of their time in the air.

Subspecies

The green violetear has four sub-species:

Description

In flight

The lesser violetear is roughly medium-sized by hummingbird standards. It averages around 9.7 to 12 cm (3.8 to 4.7 in) in total length. Its bill is black and mostly straight with only a slight downward curve and measures from 1.8 to 2.5 cm (0.71 to 0.98 in).[1][2] The body mass can vary from 4.8 to 5.6 g (0.17 to 0.20 oz).[3] Among standard measurements, the wing chord is 5.8 to 6.8 cm (2.3 to 2.7 in) and the tail is 3.5 to 4.3 cm (1.4 to 1.7 in).[4] It is shining green above with a glittering violet ear-patch on the sides of its neck. Its throat and chest are a more glittering green with a shining green belly. The tail is a metallic blue-green with more bronzy central feathers and a prominent black subterminal band.

Vocalizations

Solitary males sing from high, exposed twigs in their territory every day. Their song is a monotonously repeated sharp and dry “tsu-tzeek” at a rate of about one call per second.

Distribution and habitat

Distribution

The green violetear breeds from the highlands of Costa Rica and western Panama; mountains of northern Venezuela, and the Andes from western Venezuela to western Bolivia.

Habitat

Common habitats for the green violetear is in the canopy and borders of subtropical and lower temperate forest, secondary woodland and scrub, and clearings and gardens in the subtropical zone on both slopes of the Andes. It is recorded mostly between altitudes of 1,200 to 2,300 m (3,900 to 7,500 ft), though they will sometimes wander as far down as 500 m (1,600 ft) in search of food sources. It generally prefers more humid and high-altitude areas, such as cloud forests, than the similar sparkling violetear and is completely absent from the central valley where the sparkling violetear is most prevalent. However, the two species will sometimes be seen in the same areas feeding at flowering Inga trees.

Behavior

Diet

The lesser violetear forages alone but tends to gather at flowering trees, especially coffee-shade Inga. They feed at mid-level to canopy and often hold and defend a feeding territory. They primarily feed on nectar and small insects. The lesser violetear has been recorded as attaining the greatest flying speed ever recorded for a hummingbird, with a pair of birds having attained 90 mph (140 km/h) during a chase, although other species may be able to attain similar speeds.[5]

Breeding

Like most hummingbirds, the lesser violetear is a solitary nester. The male’s only involvement in the breeding process is to attract and mate with the female. The female is then responsible for choosing a nest location, generally on a low, small horizontal branch in a protected area. The nest is small and built from various plant materials, spider webs, and down woven together to form a sturdy cup structure. Two small white eggs are laid within the nest and the female incubates them on her own. Incubation time is 14–18 days. Hatchlings are primarily fed insects due to high nutritional requirements. No information was found on the length of the nestling stage or age at fledgling. Breeding takes place though the wet season into the early dry season, which varies by latitude.[6]

References

  1. ↑ Hilty, S.L.; Brown, W.L. (1986). A Guide to the Birds of Colombia. Princeton, New Jersey: Princeton University Press. ISBN 978-0691083728.
  2. ↑ Howell, S.N.G.; Webb, S. (1995). A Guide to the Birds of Mexico and Northern Central America. New York, New York: Oxford University Press. ISBN 978-0198540120.
  3. ↑ Weske, J.S. (1972). The distribution of the avifauna in the Apurimac Valley of Peru with respect to environmental gradients, habitat, and related species (Ph.D.). Norman, Oklahoma: University of Oklahoma.
  4. ↑ Wetmore, A. (1968). The Birds of the Republic of Panama. Part 2. Columbidae (pigeons) to Picidae (woodpeckers). Smithsonian Miscellaneous Collections. vol. 150, part 2. Washington, D.C.: Smithsonian Institution Press.
  5. ↑ Wood, Gerald (1983). The Guinness Book of Animal Facts and Feats. ISBN 978-0-85112-235-9.
  6. ↑ Hobbs, Mo; Arizmendi, M.C.; Rodríguez-Flores, C.; Soberanes-González, C. (2011). Schulenberg, T.S., ed. "Green Violetear (Colibri thalassinus)". Neotropical Birds Online. Ithaca: Cornell Lab of Ornithology.

External links

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