7500 x 5005 px | 63,5 x 42,4 cm | 25 x 16,7 inches | 300dpi
Data acquisizione:
25 novembre 2018
Ubicazione:
452 Torrens Valley Rd, Gumeracha SA, Australia
Altre informazioni:
Peafowl is a common name for three species of birds in the genera Pavo and Afropavo of the Phasianidae family, the pheasants and their allies. Male peafowl are referred to as peacocks, and female peafowl as peahens.[1] The two Asiatic species are the blue or Indian peafowl originally of the Indian subcontinent, and the green peafowl of Southeast Asia; the one African species is the Congo peafowl, native only to the Congo Basin. Male peafowl are known for their piercing calls and their extravagant plumage. The latter is especially prominent in the Asiatic species, which have an eye-spotted "tail" or "train" of covert feathers, which they display as part of a courtship ritual. The functions of the elaborate iridescent colouration and large "train" of peacocks have been the subject of extensive scientific debate. Charles Darwin suggested they served to attract females, and the showy features of the males had evolved by sexual selection. More recently, Amotz Zahavi proposed in his handicap theory that these features acted as honest signals of the males' fitness, since less-fit males would be disadvantaged by the difficulty of surviving with such large and conspicuous structures. Plumage Head A leucistic Indian peacock File:Biomechanics-of-the-Peacocks-Display-How-Feather-Structure-and-Resonance-Influence-Multimodal-pone.0152759.s002.ogv Video analysis of the mechanisms behind the display Peacock from behind The Indian peacock has iridescent blue and green plumage, mostly metallic blue and green, but the green peacock has green and bronze body feathers. In both species, females are as big as males, but lack the train and the head ornament.[2] The peacock "tail", known as a "train", consists not of tail quill feathers, but highly elongated upper tail coverts. These feathers are marked with eyespots, best seen when a peacock fans his tail. Both sexes of all species have a crest atop the head.
