Birds of New York, Vol. 2 (Classic Reprint)

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Excerpt from Birds of New York, Vol. 2 Climatic. Of the natural factors which in¿uence the bird life of any part of the world, those due to the climate are undoubtedly of foremost importance. Among these is light, the effect of which may be illustrated by reference to owls, goatsuckers and woodcocks, which feed mostly by night or in the twilight, and in the daytime must hide away in hollows or dark portions of the forest. To a less extent the in¿uence of this factor is observed in those forest species such as many thrushes and wood warb lers whose eyes are noticeably larger than those of their relatives which live in more open surroundings, and unquestionably the intensity of light affects their nervous equilibrium to such an extent that it even determines their presence or absence in a given locality, apart from all other factors. T emperature has usually been considered the most important climatic factor and is the principal one taken into account by the United States Biological Survey in mapping the distribution of animals in America. As illustrations of this factor, it is frequently evident when surveying a ravine in central New York or when approaching the outskirts of the Adirondacks, that such species as the Junco, Canada warbler and Hermit thrush will frequently be present or absent according as the average temperature varies 2 or 3 degrees during the six hottest weeks of summer. 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.