Other than the special case of the endangered California Condor (Gymnogyps californianus), no other large raptor has a distributional range as small as that of the Philippine Eagle (Pithecophaga jefferyi). Whereas the extent of occurrence (EOO) of the rather bigger Harpy Eagle (Harpia harpyja) is 15.5 million km2 and that of the rather heavier Steller’s Sea-Eagle (Haliaeetus pelagicus) is (when breeding) 3 million km2, the Philippine Eagle is crowded into a comparatively restricted 550,000 km2 (BirdLife International 2024); indeed, the four islands that make up the bird’s range—Luzon, Samar, Leyte, and Mindanao—have a combined area of only 215,000 km2. Given that large predatory species live at relatively low densities and necessarily possess large ranges (Colinvaux 1978), the situation of the Philippine Eagle is particularly unusual. Of three early estimates of the species’...
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June 2025
LETTER|
May 05 2025
Uncertainty and Precaution in Estimating the Population Size of the Philippine Eagle Available to Purchase
Nigel J. Collar;
Nigel J. Collar
1BirdLife International, David Attenborough Building, Pembroke Street, Cambridge, CB2 3QZ, UK
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Alex J. Berryman
Alex J. Berryman
*
1BirdLife International, David Attenborough Building, Pembroke Street, Cambridge, CB2 3QZ, UK
* Corresponding author: [email protected]
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Journal of Raptor Research (2025) 59 (2): 1–6.
Article history
Received:
November 08 2024
Accepted:
January 24 2025
Citation
Nigel J. Collar, Alex J. Berryman; Uncertainty and Precaution in Estimating the Population Size of the Philippine Eagle. Journal of Raptor Research 1 June 2025; 59 (2): 1–6. doi: https://doi.org/10.3356/jrr2484
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