The Philippine Eagle Foundation (PEF) has disclosed that the national bird is confronting not only habitat loss and direct threats but also a genetic crisis. A recent study indicates a limited gene pool among Philippine Eagles, which could jeopardize the species' future.
Alarming Genetic Findings
Dr. Jayson Ibañez, PEF Director of Research and Conservation, highlighted that the newest threat is low genetic diversity, leading to reduced fitness, lower survival rates, and diminished adaptability in offspring. He described the situation as alarming, urging immediate action through support for the conservation breeding program.
During the Kapehan sa Dabaw event on May 4, 2026, Ibañez explained that Philippine Eagles face multiple crises. Habitat loss due to deforestation is critical, as eagles are forest-dependent and cannot survive outside these ecosystems. Additionally, survival threats such as shooting, trapping, and accidental drowning at sea increase mortality rates.
Inbreeding and Gene Flow
The study reveals very low genetic diversity and rising cases of inbreeding among wild eagles. Limited gene flow between subpopulations, driven by hunting and habitat pressure, forces young eagles to disperse. However, high mortality among juvenile and immature eagles—18 out of 20 rescued from 2019 to 2022 were juveniles—deprives populations of individuals that would normally spread genetic diversity.
Conservation Breeding as a Solution
To address the shrinking genetic pool, PEF employs cooperative artificial insemination. This technique allows female eagles to receive semen from multiple males, doubling breeding output from one egg every two years to two eggs per year. By using diverse semen, the foundation maximizes offspring genetic diversity. These offspring are then released into isolated mountains to introduce new bloodlines into wild populations.
PEF currently houses 16 eagles for breeding and seeks public sponsorship for three cages at the National Bird Breeding Sanctuary (NBBS) in Toril. Ibañez expressed optimism that with science, local government support, and public assistance, the low genetic diversity can be reversed, enhancing eagle survival.
Research and Future Plans
The study, based on blood samples collected in February 2025 and published in April 2026, serves as a blueprint for conservation efforts. Ibañez thanked the Philippine Genome Center at the University of the Philippines–Diliman for their genetic research, which now guides pairing strategies to avoid genetic similarity and prevent abnormalities. Annual physical exams confirm that all 31 eagles under PEF care are in excellent health.
PEF also plans to fast-track translocation of eagles to other areas, particularly to address inbreeding in the Samar subspecies. The Samar population suffers from a lack of genetic input from Leyte eagles, which were wiped out by Typhoon Yolanda. Natural gene flow requires at least one eagle per generation (40–50 years) to migrate, but this no longer occurs due to dwindling numbers. With robust data, PEF aims to translocate more eagles to Leyte by 2026.
