BIRDWALKERMONDAY

Tuesday, 2 March 2021

17-4-2018 CHOBE RIVER, BOTSWANA - GREATER KUDU (Tragelaphus Strepsiceros)

The Greater kudu (Tragelaphus strepsiceros) is a woodland antelope found in Africa. Despite occupying such widespread territory, Greater kudus are sparsely populated in most areas due to declining habitat, deforestation, and poaching.

Greater kudus have a narrow body with long legs, and their coats can range from brown/bluish-grey to reddish-brown. They possess between 4 and 12 vertical white stripes along their torso. The head is usually darker in color than the rest of the body and exhibits a small white v-shaped mark that runs between the eyes. Bulls tend to be much larger than cows, and vocalize much more; they also have beards running along their throats and large horns with two and a half twists.

The range of Greater kudu extends from the east in Ethiopia, Tanzania, Eritrea, and Kenya into the south where they are found in Zambia, Angola, Namibia, Botswana, Zimbabwe, and South Africa. Other regions where they occur are the Central African Republic, Chad, the Democratic Republic of the Congo, Djibouti, Malawi, Mozambique, Somalia, Swaziland, and Uganda. These antelopes live in mixed scrub woodlands and bush on abandoned fields and degraded pastures, mopane bush, and acacia in lowlands, hills, and mountains. They will occasionally venture onto plains only if there is a large abundance of bushes but normally avoid such open areas to avoid becoming an easy target for their predators.

Greater kudus are social animals that live in groups within their home areas. Females usually form small groups of 6-10 with their offspring, but sometimes they can form a herd of up to 20 individuals. Male kudus may form small bachelor groups, but they are more commonly found as solitary and widely dispersed individuals. Solitary males will join the group of females and calves only during the mating season. Home ranges of maternal herds can overlap with other maternal herds while home ranges of adult males generally encompass the ranges of two or three female groups. Greater kudus may be active throughout the 24-hour day. During the day, they normally cease to be active and instead seek cover under woodland, especially during hot days. They feed and drink in the early morning and late afternoon, acquiring water from waterholes or roots and bulbs that have high water content. When a herd is threatened by predators, an adult (usually female) will issue a bark to alert the rest of the herd. Greater kudus communicate using many other vocalizations, including low grunts, clucks, humming, and gasping.

Sunday, 28 February 2021

17-4-2018 CHOBE RIVER, BOTSWANA - EGYPTIAN GOOSE (Alopochen aegyptiaca)

The Egyptian goose, Alopochen aegyptiaca, is a striking bird, native to Sub-Saharan Africa and the Nile Valley. It is a member of the Anatidae family, which includes ducks, geese, and swans. This species is unique in its appearance, resembling a goose more than a duck when in flight, with a heavy and robust stature. Adults typically measure between 63 to 73 centimeters in height.

Both sexes of the Egyptian goose display identical plumage, though males are generally larger. Plumage tones can vary from grey to brown, not necessarily indicative of age or sex. Mature birds boast a significant white patch on their wings, concealed by wing coverts when at rest but prominently displayed when the bird is agitated or in flight.

The Egyptian goose favors open or semi-open environments, often found near freshwater sources. Its habitat ranges from lowlands to high altitudes, such as the Ethiopian Highlands, up to 4,000 meters above sea level. It avoids dense forests and deserts.

This species is widespread and common in its native range, though numbers have dwindled in the northern Nile Valley. Historically found in southeastern Europe and parts of the Middle East, its presence in these areas has diminished.

The Egyptian goose is largely terrestrial, capable of perching on trees and buildings. It is known for its aggressive territorial behavior, especially during breeding season, and is not hesitant to engage in aerial combat with intruders. The species is monogamous, with both parents caring for their offspring.

The male's call is a subdued, hoarse quack, becoming louder and more rapid when agitated, resembling a steam engine. The female's quack is raucous and frequently heard, particularly when defending her young.

Nesting occurs in a variety of locations, with a preference for holes in mature trees. Both parents incubate the eggs, and the young are capable of foraging for themselves shortly after hatching.

Egyptian geese primarily consume seeds, leaves, grasses, and plant stems. They may also eat small animals such as locusts and worms. Goslings initially feed on small aquatic invertebrates before transitioning to grazing.

The Egyptian goose is classified as Least Concern by the IUCN, indicating a stable population. However, in regions where it has been introduced, it is considered invasive and may pose a threat to native species.

17-4-2018 CHOBE RIVER, BOTSWANA - AFRICAN JACANA (Actophilornis africanus)

The African Jacana, Actophilornis africanus, is a distinctive wader known for its remarkable ability to traverse floating vegetation with its elongated toes and claws. This bird exhibits a striking chestnut plumage on its upperparts, complemented by black wingtips, rear neck, and an eyestripe. Adults boast a chestnut underpart, while juveniles display a white underpart with a chestnut belly patch. A blue bill, extending into a coot-like head shield, and grey legs and toes complete its unique appearance.

To identify the African Jacana, look for its long toes and claws, which are adapted for walking on lily pads and other floating vegetation. The adult's chestnut underparts contrast with the juveniles' white underparts and chestnut belly patch. The blue bill with a frontal shield and the bird's size, ranging from 23 to 31 cm in length, are also key identification features.

The African Jacana thrives in shallow lakes, where it can be seen gracefully walking on floating vegetation, a habitat it prefers and is uniquely adapted to inhabit.

This species enjoys a wide distribution across sub-Saharan Africa, where it is commonly found in suitable wetland habitats.

The African Jacana is sedentary, with some seasonal dispersion. It exhibits a polyandrous mating system, where a dominant female mates with multiple males. The males are solely responsible for incubating the eggs and rearing the chicks, showcasing remarkable adaptations for parental care, such as the ability to carry chicks under their wings.

Breeding occurs throughout sub-Saharan Africa. The African Jacana lays four brown eggs marked with black, in a nest that floats amidst the vegetation. The male takes on the role of incubating the eggs and caring for the young, a testament to the species' unique breeding system.

The African Jacana might be confused with the Madagascar Jacana, which is similar in size. However, the latter is geographically isolated to Madagascar, reducing the likelihood of confusion within the African Jacana's range.

The diet consists primarily of insects and other invertebrates, which the African Jacana deftly picks from the water's surface or from the floating vegetation it frequents.

The IUCN Red List classifies the African Jacana as Least Concern, indicating that, currently, there are no immediate threats to its population levels.