The black harrier is a medium-sized raptor characterized by its striking colouration and distinct flight pattern. It possesses predominantly dark plumage with a glossy black tone across the head, back and upper wings. The wings and tail exhibit a stark white banding pattern, contrasting sharply against the darker feathers. Notably, the underparts and underwing coverts are more of a light grey, giving it a distinctive two-tone appearance while in flight. This bird's rounded head and sharp-hooked beak are adapted for its predatory lifestyle.