Rhopodytes viridirostris

The Green-billed Malkoha is easily identified by its elongated body and striking green bill, which contrasts sharply with its predominantly black and white plumage. Adults exhibit a glossy black head and upperparts with a white belly. The tail is long and graduated, showing a distinct white tip that aids in identification during flight. Juveniles are similar to adults but may show less gloss and a more muted coloration.

Males and females are alike in plumage, making visual sex differentiation challenging without behavioral observation. In flight, the Green-billed Malkoha's silhouette is distinctive, with broad wings and a long tail that provide a unique, buoyant flight pattern. When perched, they often display a characteristic hunched posture, which, combined with their long tail, makes them unmistakable.

While there are few species with which the Green-billed Malkoha could be confused, its green bill and tail pattern are distinguishing features. Similar species within the same range, such as the Red-faced Malkoha, can be differentiated by their facial coloring and different bill shape.

The diet of the Green-billed Malkoha primarily consists of insects, making it an insectivore with a preference for caterpillars, beetles, and grasshoppers. This diet can vary seasonally, aligning with the availability of prey. During the breeding season, when insect populations peak, they consume a higher volume of caterpillars, which provide essential nutrients for reproduction.

Their foraging technique is methodical, often involving slow movements through dense vegetation where they can pick insects off leaves and branches. They are known to occasionally consume small vertebrates and fruits, but these constitute a minor part of their diet. The Green-billed Malkoha typically forages during the day, with peak activity in the early morning and late afternoon.

The Green-billed Malkoha is generally solitary or found in pairs, displaying a somewhat secretive nature. These birds are territorial during the breeding season, often engaging in vocalizations to establish dominance and attract mates. Their courtship displays are elaborate, involving aerial chases and vocal exchanges.

They are not strong fliers, preferring to make short flights between trees and spend considerable time foraging in the undergrowth. Despite their tendency towards solitude, they occasionally join mixed-species feeding flocks, especially during non-breeding seasons when resources may be scarce. Their response to predators is typically to remain motionless, relying on their cryptic plumage to blend into the surroundings.

The Green-billed Malkoha constructs a simple, cup-shaped nest made from twigs and leaves, usually positioned in the fork of a tree or shrub. These nests are often well-concealed within dense foliage, providing protection from potential predators. They prefer nesting at heights of 2 to 5 meters above ground, in areas with ample cover.

A typical clutch comprises 2 to 3 eggs, which are incubated by both parents for about 15 to 18 days. After hatching, the chicks are altricial, requiring complete care and feeding from the parents. The fledging period lasts approximately 20 to 25 days, after which the young begin to explore their surroundings. The Green-billed Malkoha typically raises one brood per year, though conditions may lead to a second brood in areas with abundant resources.

The primary song of the Green-billed Malkoha is a series of low, resonant 'kow-kow' notes that are often repeated in succession. These calls carry well through dense vegetation, serving both as territorial markers and mate attractors. In addition to their primary song, they emit a variety of calls, including soft clucks and chattering sounds used in social interactions.

Alarm calls are sharp and abrupt, intended to alert nearby individuals to potential threats. During the dawn chorus, their calls are prominent, contributing to the rich tapestry of sounds in their habitat. Compared to other cuckoos, their vocalizations are less melodious but serve vital communication purposes.

• 1The Green-billed Malkoha is one of the few cuckoos that does not practice brood parasitism, raising its own young instead.
• 2Its striking green bill, which gives the bird its name, is not common among other members of the Cuculidae family.
• 3Despite its vibrant plumage, the Green-billed Malkoha is remarkably adept at blending into its surroundings, making it hard to spot.
• 4These birds have a unique feeding strategy, often using their long tails for balance while foraging in dense foliage.
• 5Unlike many birds, the Green-billed Malkoha is more active during the mid-morning hours compared to the early dawn.
• 6The species' presence is often an indicator of a healthy, biodiverse forest ecosystem.
• 7Green-billed Malkohas are known for their slow, deliberate movements, which help them stealthily approach prey.

The Green-billed Malkoha is currently listed as Least Concern on the IUCN Red List, with stable population trends across its range. While not facing immediate threats, habitat destruction due to deforestation and agricultural expansion poses potential risks to its populations. Conservation efforts focus on preserving forest habitats and promoting sustainable land use practices in regions where the bird is prevalent. Historical population data suggests stability, though continued monitoring is essential to ensure this trend persists. Education and awareness programs aim to highlight the ecological value of this species and its role in pest control.