アオクロツリスドリ Cacicus solitarius

Black cacique with a creamy white bill. Forages in dense waterside vegetation around oxbow lakes, marshes, and slow-moving rivers. Dark eye distinguishes it from similar Ecuadorian and Yellow-billed Caciques, which have light eyes. Entirely black plumage distinguishes it from other caciques; habitat is another good clue. Larger and lankier with a longer bill than other blackbirds, like Giant Cowbird and Pale-eyed Blackbird.