Vanellus selysi

Adult Vanellus selysi are unmistakable with their contrasting black and white plumage. The head and chest display a bold black coloration, while the rest of the body is predominantly white. This striking contrast serves as a key field mark. Juvenile birds, however, display duller tones, with more grayish-brown feathers that gradually transition to the adult colors as they mature. Both male and female Vanellus selysi display similar plumage, making gender differentiation challenging in the field. When compared to similar species, such as the Red-wattled Lapwing, the Vanellus selysi lacks the distinctive red wattles and exhibits a more streamlined appearance. In flight, this bird presents a broad wingspan with a characteristic pattern of black and white on the wings, which aids in identification even from a distance. Their perching posture is typical of plovers, with a slightly forward-leaning stance that highlights their long legs and upright body.

The Vanellus selysi's diet primarily consists of insects, including beetles, grasshoppers, and larvae, which they forage for along the edges of water bodies. During the wet season, their diet diversifies as they exploit the increased availability of aquatic invertebrates such as snails and small crustaceans. These birds employ a foraging technique known as 'foot-trembling', where they disturb the substrate with rapid foot movements to expose hidden prey. They typically feed during daylight hours, with peak activity observed in the early morning and late afternoon when temperatures are cooler.

Vanellus selysi exhibits solitary or small group behavior outside the breeding season, often seen foraging alone or in pairs. During the breeding season, they become highly territorial, engaging in displays and vocalizations to deter intruders. Courtship involves elaborate displays of flight and calls, with males showcasing their plumage to attract mates. These birds are generally non-aggressive towards other species but will vigorously defend their nesting area against potential threats. They maintain a diurnal activity pattern, with most foraging and social interactions occurring during daylight hours. Predators such as raptors and mammals pose a threat, prompting alarm calls and evasive flight maneuvers.

The nesting habits of Vanellus selysi involve creating simple ground scrapes, often lined with pebbles or vegetation, in open areas within their wetland habitat. They prefer sites that offer both visibility and proximity to water, providing easy access to food and protection from terrestrial predators. Clutch size typically ranges from 3 to 4 eggs, with both parents sharing incubation duties over a period of approximately 23 to 26 days. After hatching, the chicks are precocial, leaving the nest shortly after birth to follow their parents in search of food. Fledging occurs around 35 days post-hatch, with parental care continuing until the young are capable of independent survival. Generally, only one brood is produced per year, though favorable conditions may lead to a second attempt.

The primary vocalization of Vanellus selysi is a high-pitched, repetitive 'klee-klee-klee', often heard during flight and territorial displays. This call is sharp and carries over long distances, serving as both a communication tool and a warning signal. Alarm calls consist of harsher, more rapid sequences, used to alert others of potential dangers. During the dawn chorus, their calls blend with the sounds of other wetland birds, creating a symphony of avian communication. The vocalizations of Vanellus selysi are distinct, lacking the melodious complexity of songbirds but effective in their specific contexts.

• 1Vanellus selysi can cover over 20 kilometers in a single foraging session, thanks to their efficient flight capabilities.
• 2Their striking black and white plumage serves as camouflage against predators when viewed from above or below.
• 3Unlike many plovers, Vanellus selysi does not exhibit strong migratory behavior, largely remaining within its breeding range.
• 4The species' 'foot-trembling' foraging technique is a unique adaptation to stir up hidden prey in muddy substrates.
• 5Vanellus selysi's vocalizations are among the loudest of Southeast Asian plovers, aiding in long-distance communication.
• 6These birds play a vital role in controlling insect populations, benefiting local agriculture by reducing pest numbers.
• 7Vanellus selysi can adapt to both freshwater and brackish environments, showcasing their ecological versatility.

The Vanellus selysi is currently listed as Least Concern by the IUCN, with stable population trends across its range. However, the species faces threats from habitat loss due to wetland drainage and agricultural expansion. Conservation efforts focus on habitat protection and restoration, emphasizing the importance of maintaining wetland ecosystems. Historically, populations have fluctuated in response to environmental changes, but recent efforts to preserve key habitats have contributed to their stability. Continued monitoring and conservation initiatives are essential to ensure the long-term survival of this species.