Information via The Philippine Eagle Foundation: The Philippine Eagle (Pithecophaga jefferyi) is a giant forest raptor endemic to the Philippines. It is considered one of the largest and most powerful eagles in the world. Unfortunately, it is also one of the world's rarest and certainly among its most critical endangered vertebrate species. The eagle is known to be geographically restricted to the islands of Luzon, Samar, Leyte and Mindanao.