The Philippine eagle (Pithecophaga jefferyi) is the second-largest eagle in the world found primarily in the Sierra Madre mountain range of Luzon. Primary lowland rainforests of the Philippines have been heavily deforested, and the Philippine eagle needs this area to breed, as well as nesting in large trees and hunting within the trees. The eagle is restricted to the islands of Luzon, Samar, Leyte, and Mindanao. Attempts for captive breeding have been unsuccessful and it is estimated that less than 700 individuals remain.