Planet of Birds

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Category: Falconiformes

Why the Vulture is plain colored

In the beginning, birds were created without covering. Ashamed of their long legs and ill-shaped bodies, they hid themselves among trees and rocks. They were also without song, as their throats had not yet been fitted for producing music. Long afterward, they learned their songs from whispering leaves, falling rain, running brooks and whistling winds. […]

Courtship Feeding And Osprey Reproduction

Western Osprey (Pandion haliaetus) Science Article 1 abstract A female Osprey (Pandion haliaetus) usually is fed exclusively by its mate between pair formation and egg-laying. Laying dates and courtship periods, but not clutch size, egg size, breeding success or female weight reserves, were correlated (negatively) with the prelaying feeding rates of 12 females breeding in […]

The occurrence of fault bars in the plumage of nestling Ospreys.

Western Osprey (Pandion haliaetus) Science Article 3 abstract We document the occurrence of fault bars in a population of nestling Ospreys Pandion haliaetus under natural conditions. Ospreys had an average of 9.9 fault bars on their rectrices, however variation was large. Fault bar formation declined linearly with age and increased symmetrically from outer to inner […]

Observations on Migratory Turkey Vultures and Lesser Yellow-headed Vultures in Northern Colombia

Turkey Vulture (Cathartes aura) Science Article 1 abstract Turkey Vultures (Cathartes aura) breed from southern Canada to Tierra del Fuego, while Lesser Yellowheaded Vultures (Cathartes burrovianus) occur from M xico through Central America to northern Argentina and Uruguay (Meyer de Schauensee 1966).It has long been known that Turkey Vultures breeding in the northern parts of […]

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