Sunday, Sep 21, 2014

Violet Sabrewings

Violet Sabrewings (Campylopterus hemileucurus)
Hummingbird Information

The Violet Sabrewings (Campylopterus hemileucurus) are native to southern Mexico through Costa Rica to western Panama, where they are relatively common. In Costa Rica, they occur in the mountains along both coasts. They typically occur at higher elevations, between 1,500 to 2,200 m, but may descend to lower elevations outside the breeding season.

They are often seen near streams, in montane forest understory and edge, as well as disturbed wooded areas and old second growth.


Description

The Violet Sabrewings are very large compared to other hummingbirds typically measuring 4.7 - 6 inches or 12-15 cm in length, which is about the size of a sparrow.The male averages 11.5 g (0.4 oz) and the female 9.5 g (0.3) in weight.

The Sabrewings are named for their long, sabre-like outermost primary flight feathers, which are thickened, flattened and bent at an angle. The black, strong bill is slightly down-curved.

Common Features: Both males and females have a long, black, decurved bill; and a long, black tail the corners of which are edged in white

Male: Plumage is mostly a deep violet. The back and wing feathers are dark green. The tail is all black except for the three white outer pairs of feathers.

Female: Her upper plumage is dark green. Chest and abdomen is grey. Her throat is violet. Her bill is especially curved.

Immatures lack the violet markings of the adult and have buff edges to the feathers. Young males may be dusky green-blue below.

Compared to other hummingbirds, which may be protective of their favored feeding flowers and/or breeding territory, the Violet Sabrewing is not very aggressive.

Violet Sabrewing Hummingbird


Calls / Vocalizations

While feeding, they make sharp twitter or "chip' sounds Its call is a sharp twitter. The male's song is a high-pitched piercing cheep tsew cheep tik-tik tsew.

Nesting / Breeding

Hummingbirds in general are solitary and neither live nor migrate in flocks; and there is no pair bond for this species - the male's only involvement in the reproductive process is the actual mating with the female.

During the breeding seasons, male Sabrewings typically gather in leks (competitive mating display) consisting of up to 10 males (most often 4 to 6). The males will sing to the females to gain their goodwill. They may fly in front of them in a u-shaped pattern.

The male will separate from the female immediately after copulation. One male may mate with several females. In all likelihood, the female will also mate with several males. The males do not participate in choosing the nest location, building the nest or raising the chicks.

The female Sabrewing is responsible for building the fairly large cup-shaped nest out of plant fibers woven together and green moss on the outside for camouflage in a protected location in a shrub, bush or tree - usually situated over a stream. She lines the nest with soft plant fibers, animal hair and feather down, and strengthens the structure with spider webbing and other sticky material, giving it an elastic quality to allow it to stretch to double its size as the chicks grow and need more room. The nest is typically found on a low, thin horizontal branch.

The average clutch consists of two white eggs, which she incubates alone, while the male defends his territory and the flowers he feeds on. The young are born blind, immobile and without any down.

The female alone protects and feeds the chicks with regurgitated food (mostly partially-digested insects since nectar is an insufficient source of protein for the growing chicks). The female pushes the food down the chicks' throats with her long bill directly into their stomachs.

As is the case with other hummingbird species, the chicks are brooded only the first week or two, and left alone even on cooler nights after about 12 days - probably due to the small nest size. The chicks leave the nest when they are about 20 days old.


Diet / Feeding

The Sabrewings primarily feed on nectar taken from a variety of brightly colored, scented small flowers of trees, herbs, shrubs and epiphytes. They favor heliconia and banana flowers; but may also visit some flowers that open during the night for bats.

They favor flowers with the highest sugar content (often red-colored and tubular-shaped) and seek out, and aggressively protect, those areas containing flowers with high energy nectar. They use their long, extendible, straw-like tongues to retrieve the nectar while hovering with their tails cocked upward as they are licking at the nectar up to 13 times per second. Sometimes they may be seen hanging on the flower while feeding.

Many native and cultivated plants on whose flowers these birds feed heavily rely on them for pollination. The mostly tubular-shaped flowers actually exclude most bees and butterflies from feeding on them and, subsequently, from pollinating the plants.

They may also visit local hummingbird feeders for some sugar water, or drink out of bird baths or water fountains where they will either hover and sip water as it runs over the edge; or they will perch on the edge and drink - like all the other birds; however, they only remain still for a short moment.

They also take some small spiders and insects - important sources of protein particularly needed during the breeding season to ensure the proper development of their young. Insects are often caught in flight (hawking); snatched off leaves or branches, or are taken from spider webs. A nesting female can capture up to 2,000 insects a day.

Males establish feeding territories, where they aggressively chase away other males as well as large insects - such as bumblebees and hawk moths - that want to feed in their territory. They use aerial flights and intimidating displays to defend their territories.


Metabolism and Survival and Flight Adaptions - Amazing Facts


Species Research by Sibylle Johnson

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