Centropus chlororhynchos (Ati Kukula): The Unique Sri Lankan Coucal – By Bhanuka – eLanka
Centropus chlororhynchos, commonly known as the Sri Lankan Green-billed Coucal or locally as Ati Kukula, is an extraordinary bird endemic to the wet zone forests of Sri Lanka. This elusive and striking bird, with its distinctive green bill and unique call, holds a special place in the island’s rich biodiversity. Often heard before it is seen, the Ati Kukula is a symbol of Sri Lanka’s tropical rainforests and an important part of the country’s avifaunal heritage.
Physical Description
The Sri Lankan Green-billed Coucal is a medium-sized bird characterized by its striking green bill, which sets it apart from other coucals. It has a robust, glossy black body, a chestnut-brown back, and a long, broad tail. The bird’s iridescent blue-black plumage glistens in sunlight, making it a beautiful sight against the lush green backdrop of Sri Lanka’s forests.
Adult males and females are similar in appearance, though females are slightly larger. The bright green bill, a unique feature of this species, contrasts sharply with its dark feathers, aiding in identification even from a distance.
Habitat and Distribution
Centropus chlororhynchos is found exclusively in the lowland and mid-elevation rainforests of Sri Lanka, particularly in the southwestern wet zone. This bird prefers dense, moist forests with thick undergrowth, where it can move stealthily in search of prey. The coucal is also occasionally spotted in tea estates, secondary forests, and home gardens adjacent to forested areas.
Some of the key areas where the Ati Kukula can be observed include the Sinharaja Forest Reserve, Kanneliya Forest Reserve, and other protected forest patches such as Kitulgala. Despite being a relatively shy bird, it is often detected by its distinctive, resonant calls echoing through the forest.
Behavior and Diet
The Ati Kukula is a ground-dwelling bird that moves with a slow, deliberate gait, often staying close to the ground or within low shrubbery. It is primarily solitary and is known for its secretive nature, preferring to stay hidden in dense vegetation. Unlike other coucals, which are more arboreal, the Green-billed Coucal forages mostly on the ground, making it vulnerable to habitat disturbance.
This species is an opportunistic feeder with a varied diet that includes insects, small reptiles, amphibians, and occasionally small birds and mammals. It plays a crucial role in controlling insect populations within its habitat. The coucal’s hunting style is distinctive—it stalks its prey silently before pouncing, often swallowing it whole.
Breeding and Nesting
The breeding season of Centropus chlororhynchos typically occurs during the rainy months when food availability is high. The bird builds a large, domed nest with a side entrance, constructed from leaves, sticks, and grasses. These nests are usually positioned low in thick bushes, well concealed to protect the eggs and chicks from predators.
Both parents are involved in nesting duties, from building the nest to incubating the eggs and feeding the chicks. The clutch size is usually two to three eggs, and the chicks are altricial, requiring extensive care and feeding from the parents until they are ready to fledge.
Conservation Status
The Sri Lankan Green-billed Coucal is listed as Near Threatened on the IUCN Red List due to habitat loss and fragmentation. The primary threat to this species is the destruction of its rainforest habitat, driven by deforestation, illegal logging, and the conversion of land for agriculture and urban development. Encroachment into forested areas continues to reduce suitable habitats, posing significant challenges to the survival of this species.
Conservation efforts in Sri Lanka, including the protection of rainforests and establishment of wildlife reserves, are crucial to preserving the coucal’s natural habitat. Awareness programs are also essential to educate local communities about the importance of preserving these unique birds and their ecosystems.
Cultural Significance
The Ati Kukula has a subtle yet significant cultural presence in Sri Lankan folklore. Often associated with rain and lush greenery, the coucal’s calls are seen as an indicator of good harvests and the onset of rains. Its elusive nature and haunting calls have woven it into the folklore as a bird of mystery, often symbolizing the untamed beauty of Sri Lanka’s rainforests.
How to Spot the Ati Kukula
For birdwatchers and nature enthusiasts, spotting the Ati Kukula can be a rewarding experience. The best times to observe these birds are early morning or late afternoon when they are most active. A visit to protected rainforest areas like Sinharaja is ideal, where guided birdwatching tours can enhance the chances of sighting this rare bird.
To spot the coucal, listen for its distinctively deep, repetitive calls, which sound like a series of “whoop” notes that resonate through the forest. Patience and a quiet approach are key, as the bird is known for its shy behavior and tendency to stay hidden.
Conclusion
Centropus chlororhynchos, the Ati Kukula, is a jewel of Sri Lanka’s rich birdlife. With its striking appearance, unique behaviors, and vital ecological role, it stands as a symbol of the country’s vibrant rainforests. Protecting the Green-billed Coucal and its habitat is not just crucial for this species but also for maintaining the ecological balance of Sri Lanka’s unique forest ecosystems. As conservation efforts continue, there is hope that this remarkable bird will thrive for generations to come, captivating the hearts of all who encounter it.
