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Více informací o knize The Zoology of the Voyage of H. M. S. Beagle, Under the Command of Captain Fitzroy, R. N., During the Years 1832 to 1836, Vol. 3

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Excerpt from The Zoology of the Voyage of H. M. S. Beagle, Under the Command of Captain Fitzroy, R. N., During the Years 1832 to 1836, Vol. 3: Birds, by John Gould, Esq. F. L. S I am led to suppose that the young birds of this species sometimes congre gate together. On the plains of Santa Cruz (lat. 50° S. In Patagonia), I saw in the month of April, or early autumn, between twenty and thirty Polybori, which I at first thought would form a species distinct from P. Brasiliensis. Amongst those I killed, there were some of both sexes but the ovarium in the hens was only slightly granular. The plumage of the different individuals was nearly similar; and in none appeared like that of an adult bird, although certainly not of a very young one. Having mentioned these circumstances to Mr. Gould, he likewise suspected it would form a new Species; but the differences appear so triżing between it and the specimens of young birds in the British Museum and in the Museum of the Zoological Society, and likewise of the figure of a young bird given by Spix, (avium Species Novae, vol. I. P. That I have thought it advisable merely to allude to the circumstance. In my specimen, which is a cock, the head, instead of being of a dark brown, which is the usual character of even very immature birds, is of a pale rusty brown. The bill and cere are less produced than in the adult P. Brasiliensis; and the cere is of a brighter colour, than what appears to be usual in the young of this species. In other respects there is such a perfect similarity between them, that I do not hesitate to consider my specimen as a young bird of the P. Brasiliensis in one of its states of change - and to be subject to great variation of plumage during growth, is known to be a character common to the birds of this sub-family. It may, however, possibly be some variety of the P. Brasiliensis, for this bird seems subject to variation Azara (voyage dans l'amérique Méridionale, vol. Iii. P. Remarks, 11 y a des individus dont les teintes sont plus faibles, ou d'un brun pale, avec des taches sur la poitrine, et d'autres qui ont des couleurs plus foncées j'ai décrit ceux qui tiennent le milieu entre les uns et les autres. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

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Zařazení knihy Knihy v angličtině Mathematics & science Biology, life sciences Zoology & animal sciences

• Plný název: The Zoology of the Voyage of H. M. S. Beagle, Under the Command of Captain Fitzroy, R. N., During the Years 1832 to 1836, Vol. 3
• Podnázev: Birds, by John Gould, Esq. F. L. S (Classic Reprint)
• Autor: Charles Darwin
• Jazyk: Angličtina
• Vazba: Brožovaná
• Počet stran: 376
• EAN: 9781333184728
• ISBN: 1333184727
• ID: 13798182
• Nakladatelství: Forgotten Books
• Hmotnost: 503 g
• Rozměry: 229 × 152 × 20 mm
• Datum vydání: 05. August 2016

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