Otarda di Ludwig

Identificazione

The Ludwig's bustard can weigh from 3 to 7.3 kg (6.6 to 16.1 lb), with a mean of 6.3 kg (14 lb) for the much larger male and 3.4 kg (7.5 lb) for the female. Length ranges from 76 to 85 cm (30 to 33 in) in females and 80 to 95 cm (31 to 37 in) in males.<p>The bird's face and front neck are coloured grey-brown while the back of the neck and face is white. The nape of the neck is coloured a dull orange. Females and juveniles vary from the male adults by their smaller size and slightly lighter coloured front neck and face.<p>The Ludwig's bustard is frequently confused with Stanley's bustard (more commonly known as the Denham's bustard), Neotis denham. The Denham's bustard, however, has a paler grey on its face and front neck, a browner nape, and is also marked with unique crown stripes of black and white on its head.

Tassonomia

Ludwig's bustard is a member of the Otididae family, which comprises the bustards. General bustard characteristics include short, stout bills; camouflaged bodies; and dwelling in savannas and grasslands.<p>Ludwig's bustard is part of the African bustard genus known as Neotis, which has three other species besides Ludwig's bustard.

Nome scientifico

Neotis ludwigii

Autorità

(Rüppell, 1837)

Ordine

Otidiiformes

Famiglia

Otididae

Genere

Neotis

Areale e habitat

Typical of a bustard, Ludwig's bustard lives in grasslands and in semi-arid regions. Their range is typically confined to the Western side of Southern Africa, in Western South Africa, Namibia, and sometimes in Botswana. The total range of the species is roughly 380 000 km2.<p>In the 1980s, the total population of Ludwig's bustards was estimated to be 56 000 – 81 000. Recent population estimates of Ludwig's bustards say that there are about 114 000 of the birds in South Africa alone.<p>It was commonly believed that the bustards tended to follow rainfall patterns, but this has since been disputed by newer research. However, there does appear to be significant evidence that these birds do prefer to live in modified habitats such as agricultural fields and pastures.<p>Ludwig's bustards do not form large flocks, tending to be seen in groups with an average size of 2.13 individuals in summer and 3.56 individuals in winter.

Migrazione

Complete migrants

Comportamento

The mating call of the Ludwig's bustard is a deep ‘bloop’ noise. Not a lot of more specific information on the vocalizations of this species is available.<p>Ludwig's bustards have a varied diet. They can eat small animals on the ground such as insects and vertebrates. Their preferred insect to consume is the locust, which are common in their habitat. They are also capable of consuming flowers and seeds.<p>Ludwig's bustards live in large, desolate regions which are difficult to access for scientific studies. They are also easily disrupted by scientists seeking to gather information on them. As such, not much information is available for the reproductive behaviors of Ludwig's bustards, but they have been reported to breed during the month of March in Namibia.

Conservazione

Tendenza della popolazione

declining