Harpy eagles require vast, intact tropical forest for nesting, making their presence or absence a powerful indicator of forest health.
Harpy eagles require intact, old-growth forest that provides both prey and the massive trees needed for nest support. Logging that removes emergent trees destroys nesting infrastructure that cannot be replaced for decades. Pairs displaced from traditional nest trees may fail to breed successfully for years. Forest integrity is not merely a conservation metric but a direct welfare determinant for individual birds.