Long-legged Buzzard (Buteo rufinus) Science Article 3
Observations were made on Long-legged Buzzard (Buteo rufinus) nests in Bulgaria between1978-83. Egg hatching interval was 29-44 hr. First nestling plumage color was dirty-white tinged beige, cere and legs yellow; iris color changed from sepia at hatching to brownish yellow-grey at fiedging.
ILIYA Ts. VATEV, J. Raptor Res. 21(1):8-13