African Sacred Ibis

Informazioni

The African Sacred Ibis is a large wading bird native to Africa and the Middle East. It is characterized by its predominantly white plumage, black head, neck, and legs, and a distinctive long, decurved black bill. Historically revered in ancient Egypt, it is now a widespread and adaptable species, though it has become an invasive species in some parts of Europe.

Dimensioni e longevità

Lunghezza

65-75 cm

Apertura alare

112-124 cm

Peso

1.2-1.5 kg

Longevità

Up to 20 years in the wild

Dieta

Omnivore, primarily carnivorous, feeding on insects, crustaceans, frogs, fish, small reptiles, and carrion.

Caratteristiche fisiche

Piumaggio

Adults have predominantly white body plumage. The head and upper neck are bare and black, as are the legs and feet. The secondary and inner primary flight feathers have dark tips, forming a black trailing edge to the wing in flight. During breeding season, ornamental scapular plumes develop, which are black with a greenish-blue gloss.

Forma del becco

Long, stout, and strongly decurved (downward-curving) black bill.

Colore degli occhi

Dark brown, with a dark orbital ring.

Colore delle zampe

Black

Caratteristiche distintive

Bare black head and neck, long decurved black bill, white body, and black ornamental plumes on the back during breeding season. In flight, the black trailing edge of the wings is prominent.

Aspetto giovanile

Juveniles have a feathered head and neck, which are dusky brown or blackish, often with some white streaking. The bill is shorter and less decurved than adults. They lack the ornamental scapular plumes. The body plumage is duller white, sometimes with brownish smudges.

Cambiamenti stagionali

During the breeding season, adults develop prominent black ornamental scapular plumes that extend over the back and tail. These are less developed or absent during the non-breeding season.

Dimorfismo sessuale

Males and females are generally monomorphic in plumage and size, though males may be slightly larger on average.

Come identificare

1. 1

   Plumage

   Look for the striking contrast of a pure white body against a bare black head and neck. Breeding adults will show black ornamental plumes on the back.

2. 2

   Bill

   Observe the long, stout, and distinctly decurved black bill, which is a key identification feature.

3. 3

   Legs and Feet

   Note the long, black legs and feet.

4. 4

   Flight

   In flight, the black trailing edge of the wings (formed by the dark tips of secondary and inner primary feathers) is very noticeable against the white body.

5. 5

   Juveniles

   Young birds have a feathered, dusky head and neck, and a less decurved bill, but still retain the overall white body plumage.

Habitat e areale

Biomi

Wetlands, grasslands, savannas, agricultural lands, coastal areas, estuaries, and urban environments.

Areale geografico

Sub-Saharan Africa, southeastern Iraq, and formerly Egypt. Introduced and established populations exist in parts of Europe (e.g., France, Italy, Spain, Portugal) and the United States (Florida).

Fascia altitudinale

Primarily lowlands, from sea level up to approximately 1,500 meters.

Ambienti preferiti

Shallow freshwater and brackish wetlands, marshes, floodplains, irrigated fields, sewage farms, refuse dumps, and coastal lagoons. They show high adaptability to human-modified landscapes.

Comportamento

Periodo di attività

Diurnal, primarily active during daylight hours for foraging and other activities.

Abitudini alimentari

Forages by probing in soft mud or shallow water with its long bill, often sweeping it from side to side. Also gleans prey from the surface and forages in dry terrestrial habitats. Highly opportunistic, feeding on a wide variety of invertebrates (insects, worms, crustaceans, mollusks), amphibians (frogs, tadpoles), fish, small reptiles, eggs, nestlings, and carrion. Known to scavenge at refuse dumps.

Comportamento sociale

Highly gregarious, typically found in flocks of varying sizes, often numbering in the hundreds or even thousands, especially outside the breeding season. Breeds in colonies, often alongside other waterbird species.

Tipo di volo

Strong, direct flight with slow, deliberate wing beats. Often flies in V-formations or in long, diagonal lines. Glides frequently on outstretched wings.

Migrazione

Generally resident in many parts of its range, but some populations undertake seasonal movements in response to rainfall and food availability. For example, populations in the Sahel region of Africa move south during the dry season. Introduced populations are largely sedentary.

Territorialità

While breeding, pairs defend a small area around their nest within the larger colony. Outside the breeding season, they are not territorial and forage communally.

Riproduzione

Stagione riproduttiva

Highly variable depending on geographic location and rainfall patterns. Typically coincides with the rainy season or post-rainy season when food is abundant. In some regions, it can breed almost year-round.

Abitudini di nidificazione

Colonial breeder, often in large mixed-species colonies. Nests are typically platforms of sticks, reeds, or other vegetation, built in trees, bushes, on cliffs, or on the ground on islands. Both parents contribute to nest building.

Dimensione della covata

2-4 eggs

Descrizione dell'uovo

2-4 (occasionally 1-5) eggs, dull white or pale bluish-green, often stained brown. Dimensions average about 65 x 45 mm.

Periodo di incubazione

21-29 days, primarily by the female, but both parents participate.

Periodo di involo

Chicks fledge at about 35-40 days, but remain dependent on parents for several weeks thereafter.

Cure parentali

Both parents share incubation duties and care for the young, feeding them by regurgitation.

Dove trovarlo

Consigli sul campo

1. Look for flocks. African Sacred Ibises are highly gregarious. Look for groups foraging together or flying in V-formations.
2. Observe foraging behavior. Watch for their characteristic probing action in mud or shallow water, sweeping their bill from side to side.
3. Listen for calls. While generally quiet, listen for their guttural grunts and croaks, especially in breeding colonies or when disturbed.
4. Check refuse dumps. In some regions, particularly where they are introduced, they are frequently found scavenging at refuse dumps.

Specie simili

Fatti rapidi

Conservation Status:

Least Concern

Diet:

Omnivorous (primarily carnivorous)

Habitat:

Wetlands, grasslands, agricultural lands, coastal areas

Social Behavior:

Highly gregarious, colonial breeder

Key Identification Mark:

Bare black head/neck, white body, decurved black bill

Curiosità

• The African Sacred Ibis was revered in ancient Egypt, associated with the god Thoth, who was the god of writing, magic, wisdom, and the moon. Mummified ibises are commonly found in ancient Egyptian tombs.
• Despite its historical significance in Egypt, the species is now extinct as a breeding bird in the country, though vagrants are occasionally seen.
• It has become an invasive species in several European countries (e.g., France, Italy) and the United States (Florida) due to escapes from zoos and private collections, posing threats to native wildlife.
• Its adaptability to various habitats, including human-modified landscapes and even refuse dumps, contributes to its widespread success and 'Least Concern' conservation status globally.

Classificazione scientifica

Regno

Animalia

Phylum

Chordata

Classe

Aves

Ordine

Pelecaniformes

Famiglia

Threskiornithidae

Genere

Threskiornis

Specie

Threskiornis aethiopicus

Esplora African Sacred Ibis