Long-winged raptor, often seen in large kettles on migration. Breeds in montane forests, where its strident two-note whistle is often heard. Adult is brown with a spotted belly, a clean white throat bordered by two black streaks and distinct white eyebrow. Juvenile is more extensively white on the head and belly, with brown upperparts sometimes blotched with white. Can be confused with Oriental Honey-Buzzard but head proportionately larger, wings narrower, and barring on the wings weaker.