The black-winged lapwing or greater black-winged lapwing (Vanellus melanopterus) is an east African species that is found from the Ethiopian highlands in the north to central Kenya (race V. m. melanopterus). It is a habitat specialist of short grass in well-watered temperate grasslands. They may move about locally to find ideal situations, often at night. In their tightly grouped flying flocks they resemble plovers.
The black-winged lapwing behaves somewhat like the similar-sized but more generally occurring crowned lapwing and the two species sometimes occur in mixed flocks.
The leg colour brightens during the spring breeding season, when the birds sometimes move to higher elevations. Males show mutual aggression at this time and establish territories by calling and display flights which may include exaggerated wing beats. A receptive female will follow the male in flight and copulation may follow soon after. The top of a slope in burnt grassland is a favourite location for nesting.
Black-winged lapwings hunt termites on the ground, which constitutes a large part of their diet. They also take tenebrionid beetles and ants, and in captivity prefer earthworms and mealworms. Feeding territories of smaller than one hectare are defended by small groups of these birds. Newly found territories are most aggressively defended through vocal and visual threat displays or aerial mobbing. Large groups however form non-territorial flocks when ample habitat is found.
Source : Wikipedia