Hadada Ibis in Tanzania

What Is the Hadada Ibis?

The Hadada Ibis (Bostrychia hagedash) is a distinctive African ibis - grey-brown in body, with a long down-curved bill, a narrow white cheek stripe and glossy green-purple wing coverts that flash colour in good light.

Its name is its voice: a loud three- or four-note "haa-daa" call fired off in flight, especially during morning departures and evening returns to communal roost trees.

Unlike wetland-specialist ibises, the Hadada is a creature of moist grassland, soft soil and woodland edges - and it thrives near people, probing lawns, gardens, sports fields and cultivated land for earthworms and insect larvae.

In Tanzania it is common throughout the country, especially in moister areas, from Tarangire to the Arusha area.

Scientific Classification

Four subspecies are generally recognized across the species’ sub-Saharan range, which stretches from Sudan and Senegal south to South Africa. The scientific name - originally Tantalus hagedash - echoes the same onomatopoeic "haa-daa" call that gave the bird its common name.

How to Identify a Hadada Ibis

• Grey-brown body plumage on a large ibis frame.
• Narrow white stripe across the cheeks - sometimes called a "moustache," though it does not reach the mouth corners.
• Long down-curved bill, greyish-black - with a diagnostic red culmen (ridge of the upper mandible) during the breeding season.
• Iridescent green/purple wing-coverts produced by microscopic feather structures rather than pigment.
• Stout black legs; upper toe surfaces also turn reddish as breeding begins.
• Broad, powerful wings enabling quick take-offs and manoeuvring through trees.
• Immatures are duller - lacking the full adult gloss and red bill markings.

Size Summary

• Length: approximately 65-76 cm
• Body mass: around 1.2 kg on average (source variation exists)

Why Is It Called the Hadada Ibis?

The name is pure onomatopoeia: the bird announces itself with a loud, raucous, trumpeting "haa-daa" (often rendered "haa-haa-haa-de-dah"), a three- or four-note call that carries far across valleys and suburbs alike.

The call is especially conspicuous at two moments of the day:

• Morning departures - flocks burst from their communal roost trees, calling as they fan out to feeding grounds.
• Evening returns - the same chorus greets their arrival back at the roost at dusk.

Birds also call loudly in group interactions and when startled. Few African birds are so reliably identified by ear first - many visitors hear the Hadada long before they see one.

What Does the Hadada Ibis Sound Like?

The signature voice is a coarse, repetitive, trumpeting series - loud enough to wake a safari camp. But the species has more than one note in its repertoire:

• Flight and roost calls: the famous loud "haa-daa" triple or quadruple phrase.
• Single roost call: a drawn-out "haaaa" uttered from perched birds.
• Contact call while foraging: an unexpected low growl - often compared to a young puppy - keeping scattered flock-mates in touch.
• Body displays: posture, bill orientation and wing positions communicate within groups alongside these voices.

No scent communication plays any recorded role; this is a bird that talks in sound and posture.

Male vs Female: Key Differences

Males and females are broadly similar externally - same grey-brown plumage, white cheek stripe and curved bill - with no major sex-specific field marks reported by reliable sources.

Both sexes participate fully in breeding:

• Nest construction - building the twig platform together.
• Incubation - shared shifts on the eggs.
• Chick care - both parents feed and guard young.

Habitat: Moist Grassland to City Lawns

The Hadada Ibis is emphatically not a wetland specialist like the Goliath Heron or African Spoonbill. Water matters, but soft soil matters more:

• Moist grassland and savanna - the core natural habitat.
• Open woodland, woodland edges and forest clearings - nesting cover.
• Gardens, lawns, parks and sports fields - superb artificial foraging.
• Cultivated fields and irrigated land - permanently soft ground.
• Wetlands, river margins and floodplains - used where available.

The common thread is moist, soft soil that yields to probing - plus trees for roosting and nesting. In parts of southern Africa the species’ range expanded dramatically during the twentieth century precisely because tree planting, irrigation and urban green space created more Hadada habitat.

Habitat and Global Distribution

Hadada Ibises have a broad sub-Saharan African distribution, occurring from Sudan and Senegal across East and Central Africa to southern Africa. Four subspecies are recognized across this range.

Tanzania is part of the species’ natural range - not its global center, but solidly within it, with common presence throughout the country’s moister regions.

Remarkably, the species’ range in southern Africa expanded nearly two-and-a-half-fold during the twentieth century as tree planting, irrigation and urban green space created new soft-soil habitat - one of few large African birds that has benefited from certain human landscape changes.

Hadada Ibis in Tanzania

The Hadada Ibis is common throughout Tanzania, especially in the moister parts of the country. Documented Tanzanian presences include:

• Tarangire National Park - recorded birds and imagery from the park’s swamps and riverine areas.
• Lake Manyara National Park - adult birds documented around the park’s moist margins.
• Arusha area - including gardens and green spaces in and around the city.
• Silale Swamp (Tarangire) - moist swamp-edge habitat.
• Burigi-Chato National Park - in Tanzania’s wetter northwest.
• Malagarasi Swamp - one of Tanzania’s great wetland systems.

Sightings vary by specific location and local conditions, but within suitable habitat this is one of the country’s more dependable birds.

Hadada Ibis in Pictures

A closer look at the Hadada Ibis in its natural East African habitat — its striking appearance, habitat and behaviour are best appreciated up close.

What Does the Hadada Ibis Eat?

The menu is dominated by soil-dwelling invertebrates, with opportunistic extras:

• Earthworms - a staple of soft, moist soil.
• Insect larvae - including beetle and moth larvae dug from lawns (the reason golf-course managers welcome them).
• Grasshoppers, crickets and other insects - including large species.
• Millipedes - taken readily despite their chemical defences.
• Snails.
• Spiders.
• Small lizards and other small prey where documented.

Plant material may be consumed opportunistically, but animal protein from the soil is what drives this bird’s daily search.

How Does the Hadada Ibis Find Food?

1. Walks deliberately across lawns, grassland or soft cultivated ground.
2. Probes the soil with the long scimitar-curved bill, sweeping it into the earth.
3. Detects hidden prey with sensory pits clustered near the bill tip - touch receptors that sense buried worms and larvae without the bird ever seeing them.
4. Extracts prey with a deft twist of the bill before swallowing.
5. Works grazing landscapes, where livestock dung and trampled sward concentrate soil organisms.

This sensory probing puts Hadadas in elite company: spoonbills, certain sandpipers and even kiwis use comparable bill-tip pits to find unseen subterranean food - a remarkable case of evolutionary convergence.

Social Life and Calls

Outside breeding, Hadada Ibises may forage alone or in small groups, and commonly form communal tree roosts that can gather many birds overnight.

• Roost gatherings produce loud, synchronized vocal activity at departure and return.
• Pairs are monogamous and likely maintain long-term bonds, nesting solitarily rather than colonially.
• Vocal life spans the trumpeting flight calls, single roost notes and low puppy-like growls exchanged between foraging companions.

There are no bachelor troops or hierarchies here - just flexible groups orbiting around faithful pairs and reliable roost trees.

Breeding, Nesting and Young

Hadada Ibises are egg-laying birds, monogamous and usually solitary nesters - pairs are thought to bond long-term.

• Nest: a platform of twigs and branches placed in a large tree or suitable elevated structure - sometimes surprisingly close to human habitation.
• Timing: breeding varies with rainfall and local habitat rather than a fixed calendar; in the south of the range it is often timed to the rains.
• Eggs: typical clutch of around 3-4 eggs (source variation exists).
• Incubation: roughly 26 days, shared by both parents.
• Chicks: dependent on adults in the nest; both parents feed the young.
• Fledging: young leave the nest at approximately 33-40 days old and become fully independent at roughly 60 days.

Breeding-season plumage tells the story too: the red culmen ridge and reddened toe surfaces appear as hormones surge - a temporary badge of the nesting season.

Conservation Status: Least Concern

IUCN Red List Status: Least Concern. The species is widespread across sub-Saharan Africa, common in suitable habitat, and remarkably adaptable - even expanding in some regions thanks to tree planting and irrigation in human-modified landscapes.

Least Concern does not mean zero local pressures. Carefully framed threats include:

• Habitat conversion of moist grassland and woodland.
• Pesticide exposure - reducing soil invertebrate prey and posing direct toxicity risks.
• Wetland and grassland degradation.
• Loss of large nesting/roosting trees.
• Disturbance at sensitive sites.

The practical conservation story for this bird is landscape-level: healthy soils, sensible pesticide use, and keeping big trees standing. No species-specific programme claims are made here - the Hadada’s success is written in adaptable behaviour, not projects.

Hadada Ibis Facts

Photographing the Hadada Ibis

• Bird calling in flight - open bill, spread wings, morning light.
• Morning roost departure - flocks bursting from treetops together.
• Evening roost return - silhouettes dropping into canopy at dusk.
• Probing soft ground - bill buried, worm extracted.
• Iridescent wing-coverts - catch angled light for the green-purple sheen.
• Close-up bill - the curve, the white moustache, red culmen in season.
• Garden and grassland scenes - the human-neighbour portrait.
• Tree-roost perches - birds settled for the night.

Ethics first: never disturb communal roosts or nesting trees; photograph from paths and follow your guide’s instructions.

Frequently Asked Questions

Related Animals

References & Further Reading

• BirdLife DataZone: Bostrychia hagedash factsheet - Least Concern assessment.
• eBird / Merlin (Cornell Lab): Hadada Ibis species account - identification and vocalizations.
• Birds of the World (Cornell Lab): Matheu et al. - taxonomy, subspecies, distribution.
• Wikipedia (Hadada ibis): morphology, sensory bill pits, diet and range-expansion literature.
• BDI (Biodiversity & Development Institute): Southern African species text - breeding and habitat data.
• About these facts: measurements and timings are approximate ranges drawn from available sources; they vary with sex, age, region and method.