Wednesday, Jul 23, 2014

Southern Bald Ibises

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Southern Bald Ibis (Geronticus calvus)


Southern Bald Ibis (Geronticus calvus) The Southern Bald Ibis (Geronticus calvus) occurs naturally in the open grassland or semi-desert in the mountains of southern Africa.

It can be differentiated from the closely related Northern Bald Ibis of Northern Africa by its reddish face.


Description

The Southern Bald Ibis is a large, glossy black ibis that measures 70–80 cm (28–31 in) in length, with a 125–135 cm (49–53 in) wingspan, and an average weight of 1.0–1.3 kg (35–46 oz).

The plumage is mostly glossy black with a bronze-green and violet iridescence. It has a dull red head and a long, curved red bill.

Males and females look alike, except males tend to be larger than females and have longer bills.

Southern Bald Ibis on nest - note the chick to the left


Southern Bald Ibis (Geronticus calvus) eating a mouse Breeding

The Southern Bald Ibises reach reproductive mature at age 3 - 5 and once they find their mate, they form life-long pair bonds.

They breed in loosely spaced colonies on the coast or near rivers.

The male chooses a nest site, prepares it and then advertises himself to available females by waving his crest and emitting low rumbling calls. In bonded pairs, their bond is reinforced through bowing displays and mutual preening.

Their shallow loosely-constructed, cup-shaped platforms of sticks and grasses are typically situated on cliffs or amongst boulders on steep slopes.

The average nest consists of 2 - 4 oval eggs, which weigh about 50.16 f (1.8 oz) which are 0.93 cm long and 0.68 cm wide (2.37 × 1.73 in). Initially, these eggs are blue-white with brown spots, but they turn brownish during the incubation process.

The eggs are incubated for about 24 - 25 days to hatching. Both parents care for the chicks. The young fledge when they are about 40 - 50 days old. They usually take their first flight when they are about 2 months old.

Southern Bald Ibis (Geronticus calvus) Juvenile Birds

The chicks have a pale brown down. The fledged juveniles look like adults, except the head is dark, the feet are light grey and the bill is pale-colored. The unfeathered head and neck turn red as they mature.

Similar Species:

The Northern Bald resembles the Glossy Ibis, except the Northern Bald is larger and stockier.


Diet / Feeding

Northern Bald Ibises mostly feed in shallow waters on aquatic insects, mollusks, frogs, and food sifted from the water surface.

Their diet also includes insects (beetles) caught on land, as well as snails, scorpions, spiders, caterpillars, lizards, skinks, and other small reptiles.

Some species will also take small mammals and ground-breeding birds.

They use their long bills to feel for food items in the soil.


Lifespan

Their lifespan in the wild is estimated to be 10 - 15 years. Captive birds may live to 30 years.

Species Research by Sibylle Johnson

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Southern Bald Ibis (Geronticus calvus)



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