Excerpt from Revision of the North American Ground Squirrels: With a Classification of the North American Sciuridae Ground squirrel burrows are often a serious menace to the safety of irrigation systems. Birdseye (1912, p. 13) tells of a serious washout caused by irrigation water escaping through a Columbian ground squirrel's burrow located in an orchard on the bench above. Lantz (1918, p 14) cites the destruction of 6 acres of alfalfa caused by the burrowing of a California ground squirrel into an irrigation embankment. An additional count against certain of the ground squirrels is based on the part they play in the dissemination of diseases often fatal to man, as is the case with the Columbian ground squirrel in the spread of spotted fever, he California, Oregon, Uinta, Colum bian, and Richardson's ground squirrels in the spread of bubonic plague, and the California ground squirrel and the Utah rock squirrel in the spread of tularemia. 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.