Excerpt from The Distribution of Bird Life in the Urubamba Valley of Peru: A Report on the Birds Collected by the Yale University-National Geographic Society's ExpeditionsIn collecting birds Mr. Heller attempted to secure species rather than specimens and his collection, therefore, contains a much larger number of forms than its size would lead one to expect.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis 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.