It has often been considered conspecific with the Asian and Black-billed Koels, but they are increasingly treated as a separate species.
Pacific Ocean | Pacific | Canadian Pacific Railway | Pacific War | South Pacific | Union Pacific Railroad | Pacific Islands | Pacific Northwest | Northern Pacific Railway | Pacific Islander | Southern Pacific Transportation Company | 2011 Pacific Games | Indo-Pacific | South Pacific (musical) | United States Pacific Fleet | University of the Pacific | Central Pacific Railroad | University of the Pacific (United States) | Pacific Northwest Ballet | Cathay Pacific | United States Pacific Command | Asia-Pacific Economic Cooperation | Asia-Pacific | Pacific Southwest Airlines | Pacific Rim | War of the Pacific | Pacific Station | Pacific Highway | California Pacific Medical Center | University of the South Pacific |