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The Black-headed Ibis is a large wading bird characterized by its predominantly white plumage, bald black head and neck, and long, decurved black bill. It is a common resident in wetlands across South and Southeast Asia, often seen foraging in shallow waters.
Size & lifespan
- Length
- 65-76 cm
- Wingspan
- 110-125 cm
- Weight
- 1.3-1.8 kg
- Lifespan
- Up to 20 years in the wild
- Diet
- Carnivore (primarily aquatic invertebrates, fish, amphibians, and small reptiles)
Physical characteristics
- Plumage
- Adults are predominantly white with a bare, black head and neck. The back of the neck and upper mantle may show some greyish-black feathering. During the breeding season, some individuals develop greyish scapulars and tertials, and a yellowish patch on the breast.
- Beak shape
- Long, slender, and strongly decurved (downward-curving) black bill.
- Eye color
- Dark brown eyes.
- Leg color
- Dull black legs and feet.
- Distinguishing features
- The combination of pure white body plumage, bald black head and neck, and long, decurved black bill is distinctive. No other ibis in its range shares this exact combination.
- Juvenile appearance
- Juveniles have a feathered, dusky-brown head and neck, often with some white streaking. Their plumage is duller white, and the bill is shorter and less decurved than adults. They gradually acquire adult plumage over their first year.
- Seasonal changes
- During the breeding season, adults may develop a yellowish wash on the breast and some greyish plumes on the scapulars and tertials. These features are less pronounced or absent in non-breeding plumage.
- Sexual dimorphism
- Males and females are generally monomorphic in plumage and size, though males may be slightly larger on average.
How to identify
- 1
Plumage
Look for the striking pure white body plumage. Any other ibis in its range will have different coloration or markings.
- 2
Head and Neck
The bare, glossy black head and neck are unmistakable. This 'bald' appearance is a key identifier.
- 3
Bill
Observe the long, slender, and distinctly decurved (downward-curving) black bill. This specialized bill shape is used for probing.
- 4
Legs
Note the dull black legs and feet, which contrast with the white body.
- 5
Behavior
Watch for its characteristic foraging behavior of wading in shallow water and probing the mud. Often seen in flocks.
Habitat & range
- Biomes
- Wetlands, marshes, swamps, rice paddies, irrigated farmlands, shallow lakes, rivers, estuaries, and coastal mudflats.
- Geographic range
- South and Southeast Asia, including India, Sri Lanka, Bangladesh, Nepal, Pakistan, Myanmar, Thailand, Cambodia, Laos, Vietnam, and parts of Indonesia (Sumatra, Java).
- Elevation range
- Primarily lowlands, up to approximately 1,000 meters.
- Preferred environments
- Shallow freshwater and brackish wetlands with abundant aquatic vegetation and soft substrates for probing.
Behavior
- Activity time
- Diurnal, most active during the day, particularly in the morning and late afternoon.
- Feeding habits
- Forages by wading in shallow water, probing the soft mud or substrate with its long, decurved bill to find invertebrates. Also catches small fish, amphibians, and reptiles. Often feeds in small groups, sometimes alongside other wading birds.
- Social behavior
- Highly gregarious, often found in flocks of varying sizes, especially outside the breeding season. Breeds colonially, often with other waterbird species.
- Flight pattern
- Strong, direct flight with slow, deliberate wing beats. Often flies in V-formations or diagonal lines, with neck and legs extended. Glides on thermals at higher altitudes.
- Migration pattern
- Primarily resident throughout much of its range, but local movements and some seasonal migrations occur in response to rainfall and food availability. Northern populations may move south for winter.
- Territoriality
- Generally not territorial outside the breeding colony, where pairs defend a small area around their nest.
Song & calls
- Song
- Not known for a complex song. Vocalizations are generally limited to various grunts and croaks.
- Call
- Produces a variety of guttural grunts, croaks, and harsh calls, often described as 'graaak' or 'karr-karr'. Calls are typically given during flight, at roosts, or within breeding colonies.
- When they vocalize
- Most vocal during breeding season within colonies, and when disturbed or in flight.
Breeding & reproduction
- Breeding season
- Varies geographically, typically during the monsoon season (June-October in India, December-March in Sri Lanka).
- Nesting habits
- Nests colonially, often in mixed-species colonies with storks, herons, and other ibises. Nests are large platforms made of sticks, twigs, and reeds, placed in trees (often mangroves or thorny trees) or dense reedbeds, usually over water.
- Clutch size
- 2-4 eggs
- Egg description
- Typically 2-4 eggs, dull white to pale greenish-blue, often unmarked or with faint reddish-brown spots.
- Incubation period
- 21-25 days, incubated by both parents.
- Fledging period
- Chicks fledge at around 35-40 days, but remain dependent on parents for some time after leaving the nest.
- Parental care
- Both parents share incubation duties and care for the young, feeding them regurgitated food.
Where to find
Wetlands and Marshes
These are prime habitats. Look in areas with shallow water, mudflats, and emergent vegetation.
Rice Paddies and Irrigated Farmlands
Often found foraging in these agricultural areas, especially after harvest or during planting when fields are flooded.
Lakes and Rivers
Shallow edges of freshwater lakes and slow-moving rivers are good spots.
Coastal Areas
Estuaries, tidal mudflats, and mangrove fringes are also frequented.
Field tips
- Scan open wetlands. Use binoculars to scan large expanses of shallow water and mudflats, as they often feed in groups.
- Look for movement. Their probing feeding action can be subtle, but their white bodies stand out against darker backgrounds.
- Visit during breeding season. If you want to see large congregations, locate known breeding colonies, often shared with other waterbirds.
- Check agricultural areas. Don't overlook flooded fields, as they are a common foraging ground.
Similar species
Oriental White Ibis
Threskiornis melanocephalus
This is the same species. The name 'Oriental White Ibis' is an alternative common name for the Black-headed Ibis. There are no other species within its range that are easily confused with it due to its unique combination of features.
African Sacred Ibis
Threskiornis aethiopicus
While morphologically very similar (white body, bald black head/neck, decurved black bill), the African Sacred Ibis has black tertials and a black trailing edge to the underwing, which are absent in the Black-headed Ibis. Their ranges do not naturally overlap, though feral populations of Sacred Ibis exist in some parts of the world.
Quick facts
- Diet:
- Aquatic invertebrates, fish, amphibians
- Habitat:
- Wetlands, rice paddies, mudflats
- Sociality:
- Highly gregarious, colonial breeder
- Conservation Status:
- Near Threatened
- Distinguishing Feature:
- Bald black head/neck, white body, decurved black bill
Fun facts
- The Black-headed Ibis is considered sacred in some parts of India, particularly in Hindu traditions, and is sometimes referred to as the 'Sacred Ibis of India'.
- Its long, decurved bill is perfectly adapted for probing deep into soft mud to extract hidden prey, acting like a pair of specialized forceps.
- They often feed in mixed-species flocks, benefiting from the collective foraging efforts and increased vigilance against predators.
- Despite its 'Near Threatened' status, it remains relatively common in many parts of its range, but faces threats from wetland degradation and pollution.
Scientific classification
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Aves
- Order
- Pelecaniformes
- Family
- Threskiornithidae
- Genus
- Threskiornis
- Species
- Threskiornis melanocephalus
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