Blackfaced ibis

Brilibis

Blackfaced ibis (Theristicus melanopis)

De Blackfaced ibis (Theristicus melanopis) is een ibis uit de familie van de ibissen en lepelaars (Threskiornithidae).

Naamgeving

Nederlandse naam:
Brilibis
Engelse naam:
Blackfaced ibis
Duitse naam:
Schwarzzügelibis
Franse naam:
Ibis à face noire
Wetenschappelijke naam:
Theristicus melanopis

Taxonomische indeling

Orde:
Pelecaniformes
Familie:
Threskiornithidae
Geslacht:
Theristicus

Beschrijving

Uiterlijke kenmerken:

Male:
The adult of nominate race has grey upperparts. Greater wing-coverts are white, whereas primary coverts, all flight feathers, rump and tail are bluish-black or glossy green. The neck is buffy-white to pale ochraceous. On the underparts, chin, throat and breast are ochraceous-buff with grey breast band. The lower breast is more ochraceous. Belly, vent and undertail-coverts are black. On the head, forecrown crown, nape and hindneck are rufous with head darker than neck. The bare face is black, and we can see a small black bare skin area on chin and throat, as a wattle. 

The long, slender, blackish bill is decurved, with slit-like nostrils at bill base. This morphological feature allows the bird to breathe while feeding and probing into water and mud. The eyes are red, surrounded by black orbital skin. Robust legs and feet are reddish. 
Both sexes are similar.

Female:
Both sexes are similar.

Juvenile:
Juvenile shows dark streaks on neck and scaled pattern on wing-coverts due to buff feathers edges.

Gedrag:

It forages by walking slowly and probes into vegetation, soil, mud or water. When feeding in dry areas, it walks more quickly while pecking at the ground, probing in cracks or between stones. 
Thanks to its robust legs, flexible neck and long, sensitive bill, it may detect the preys by touch. Usual preys are insects, molluscs and worms, amphibians, and occasionally small birds and rodents. Small items are swallowed immediately.  

Maten en Gewicht

Lengte man:
De man (woerd) van de Blackfaced ibis heeft een lichaamslengte van ongeveer 71-76 centimeters. De vrouw (pop) heeft een lichaamslengte van ongeveer 71-76 centimeters.
Gewicht man:
Het mannetje weegt ongeveer 1100-1400 gram. Het vrouwtje weegt ongeveer 1100-1400 gram.
Het gewicht is notoir variabel en kan alleen als indicatie worden gebruikt!
Ondersoorten:

We can find two subspecies:

  • T.m. melanopis (described above) is found in S Chile and S Argentina. They move to N Argentina after breeding season. There is an isolated population in coastal Peru. 
  • T.m. brackinii occurs in highlands of Ecuador, Peru, NW Bolivia and extreme N Chile. This one is paler than nominate. Foreneck and breast are less ochraceous and more whitish. The bare skin area on chin and throat is often smaller.
Notitie:

Amongst their large colonies, the black-faced ibis is a gregarious (and noisy!) creature; it’s not uncommon to find them nesting in mixed colonies with different aquatic birds. When it comes to mating, they are monogamous and their nests are usually located in tall trees and cliffs. Breeding is a mutual partnership both sexes build the nest.

Breeding:
Het vrouwtje Blackfaced ibis legt doorgaans zo'n 2-3 yellowish white eieren het broeden duurt 28 dagen.

Ringdagen:
Aanbevolen passende ringmaat voor de Blackfaced ibis is 14 mm.
De gesloten pootring kan alleen aangebracht worden bij een jonge ibis van ongeveer 12 dagen oud.

It doesn't matter what leg that you band, but it's good to have a consistent system.
Suggested: Left leg = Female, Right leg = Male
Wetgeving:
No information about regulation available

Foto's van de Blackfaced ibis

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