Northern golden bulbul

There are six species of bird named northern golden bulbul that were split into distinct species:
 * Sangihe golden bulbul, Hypsipetes platenae
 * Togian golden bulbul, Hypsipetes aureus
 * Banggai golden bulbul, Hypsipetes harterti
 * Sula golden bulbul, Hypsipetes longirostris
 * Halmahera golden bulbul, Hypsipetes chloris
 * Obi golden bulbul, Hypsipetes lucasi