The Black-billed Koel is a species of cuckoo

Cuckoo

The cuckoos are a family, Cuculidae, of near passerine birds. The order Cuculiformes, in addition to the cuckoos, also includes the turacos . Some zoologists and taxonomists have also included the unique Hoatzin in the Cuculiformes, but its taxonomy remains in dispute...

 in the Cuculidae family. It is endemic to forest and woodland on the Indonesia

Indonesia

Indonesia , officially the Republic of Indonesia , is a country in Southeast Asia and Oceania. Indonesia is an archipelago comprising approximately 13,000 islands. It has 33 provinces with over 238 million people, and is the world's fourth most populous country. Indonesia is a republic, with an...

n islands of Sulawesi

Sulawesi

Sulawesi is one of the four larger Sunda Islands of Indonesia and is situated between Borneo and the Maluku Islands. In Indonesia, only Sumatra, Borneo, and Papua are larger in territory, and only Java and Sumatra have larger Indonesian populations.- Etymology :The Portuguese were the first to...

, Sula

Sula Islands

The Sula Islands are a group of islands in North Maluku in Indonesia. Its three main islands are Mangole, Sanae and Taliabu, with smaller islands Lifamatola and Seho. It is administered as Kepulauan Sula Regency...

, Banggai

Banggai Island

Banggai Island is the second largest of the Banggai Islands, an archipelago located at the far eastern end of Central Sulawesi, Indonesia. The largest island is Peleng, smaller islands of the group are Bowokan, Labobo, Kebongan, Kotudan, Tropettenando, Timpau, Salue Besar, Salue Kecil, Masepe, and...

, Togian

Togian Islands

The Togian Islands are an archipelago of 56 islands and islets, in the Gulf of Tomini, off the coast of Central Sulawesi, in Indonesia. The three largest islands are Batudaka, Togian, and Talatakoh...

 and other smaller nearby islands. It has often been considered conspecific with E. scolopaceus, but they are increasingly treated as separate species. Unlike the Black-billed Koel, all other members of the common koel

Common koel

The common koels are three species of cuckoos. They have commonly been considered conspecific under the scientific name Eudynamys scolopaceus, but are increasingly treated as separate species:* Asian Koel, Eudynamys scolopaceus....

 complex

Species complex

A species complex is a group of closely related species, where the exact demarcation between species is often unclear or cryptic owing to their recent and usually still incomplete reproductive isolation. Ring species, superspecies and cryptic species complex are example of species complex...

have a pale bill.