Hadada Ibis

The hadada ibis (Bostrychia hagedash) is a medium-sized, heavy-bodied ibis found across much of sub-Saharan Africa. It is about 65–76 cm long and weighs around 1.3 kg. At first glance the plumage appears grey-brown, but the wing coverts and back flash metallic green, bronze and purple in good light. A narrow pale stripe crosses the cheek, and the long downcurved bill is dark with a conspicuous red band along the upper mandible.

The loud voice is almost as diagnostic as the appearance. The repeated trumpeting ha-da-da call is commonly given in flight and around roosts and has made the species one of the most recognisable sounds in many African towns and landscapes. The species name is onomatopoeic and derives from this characteristic call.

Hadada ibises use grassland, wetland margins, riverbanks, savanna, farmland and other open habitats with soft ground suitable for probing. They are especially successful where soil remains moist enough for buried invertebrates to be both abundant and detectable.

The species has also adapted exceptionally well to parks, gardens, golf courses and irrigated urban lawns. Mature trees nearby provide resting, roosting and nesting sites, allowing birds to complete much of their daily cycle within heavily modified landscapes.

Earthworms, insect larvae and other soil-dwelling invertebrates form much of the diet. Snails and surface-active insects are also taken, together with occasional small frogs, reptiles and other small vertebrates.

Hadadas usually feed by walking slowly across grass or soft ground and repeatedly driving the curved bill into the soil. They forage alone, in pairs or in loose groups, while larger numbers can gather where food is especially abundant.

The tip of the bill contains a specialised sensory organ packed with mechanoreceptors. These receptors allow the bird to detect minute vibrations produced by moving prey underground, a sensory ability known as remote touch. Experiments published in 2024 showed that hadadas could locate buried moving prey from vibratory cues alone.

Foraging becomes more effective as soil moisture rises because damp ground is easier to probe and transmits the tiny vibrations produced by hidden prey more efficiently. The bill is therefore not simply a probing tool but a highly sensitive system for detecting prey that cannot be seen.

Hadadas are diurnal and often commute between feeding areas and communal roosts around dawn and dusk. Larger numbers can gather at roosts even though birds spread out more widely during the day.

Vocal activity is conspicuous during these movements. Pairs and groups frequently call together in flight or when disturbed, and the explosive trumpeting can carry over long distances. Although breeding pairs maintain their own nest sites rather than forming dense colonies, individuals tolerate one another readily at food and roosts outside the immediate nesting area.

Hadada ibises are monogamous and usually nest as individual pairs rather than in dense colonies. The nest is a platform of sticks and twigs, most often placed in a tree but sometimes on other elevated structures close to suitable feeding habitat.

Breeding timing varies geographically and is influenced by rainfall and food availability. Two or three eggs are typical, although clutches of one to four are known. Both parents incubate for about 25–28 days and care for the chicks, which usually fledge after roughly 33–40 days. After leaving the nest, the young may continue to depend on their parents for food for about three months while gradually becoming more independent.

Few native birds in southern Africa have expanded their range as conspicuously as the hadada ibis. Irrigation, reservoirs, agriculture and urban green spaces have created moist feeding grounds in areas that were historically too dry for efficient foraging, while planted trees provide roosting and nesting sites.

Research in South Africa has shown that soil moisture can strongly limit feeding efficiency, while urban irrigation keeps suitable feeding grounds available even during dry conditions. Hadadas have therefore not merely tolerated cities; some common forms of human land use have created conditions that suit their specialised feeding system unusually well.

The hadada ibis is classified as least concern on the IUCN Red List and remains widespread across sub-Saharan Africa.

The species has expanded strongly in parts of southern Africa and is abundant in many agricultural and urban landscapes. Drought and loss of moist feeding ground can reduce numbers locally, but the species remains common and widespread overall.