Excerpt from Estimating Muskrat Populations by House Counts For survival, muskrats depend largely on concealment and a consider able part of their existence is spent in underground tunnels and burrows, inside Of their nests and feeding shelters, in swimming, and in digging loose and gnawing on the subterranean roots of various aquatic marsh or swamp plants. For this reason their presence on an area is detected by evidence of their activity rather than on actual observation of the animals themselves. Muskrat signs may take the form of narrow channels or runs leading through the marsh to and from nesting sites and nearby feeding grounds, air bubbles under ice, bank burrows and tunnels, plant cuttings. 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.

This best-selling majors ecology book continues to present ecology as a series of problems for readers to critically analyze. No other text presents analytical, quantitative, and statistical ecological information in an equally accessible style. Reflecting the way ecologists actually practice, the book emphasizes the role of experiments in testing ecological ideas and discusses many contemporary and controversial problems related to distribution and abundance. Throughout the book, Krebs thoroughly explains the application of mathematical concepts in ecology while reinforcing these concepts with research references, examples, and interesting end-of-chapter review questions. Thoroughly updated with new examples and references, the book now features a new full-color design and is accompanied by an art CD-ROM for instructors. The field package also includes The Ecology Action Guide, a guide that encourages readers to be environmentally responsible citizens, and a subscription to The Ecology Place (www.ecologyplace.com), a web site and CD-ROM that enables users to become virtual field ecologists by performing experiments such as estimating the number of mice on an imaginary island or restoring prairie land in Iowa. For college instructors and students.

This National Book Award finalist by Pulitzer Prize-winning novelist Louise Erdrich is the first installment in an essential nine-book series chronicling 100 years in the life of one Ojibwe family, and includes beautiful interior black-and-white artwork done by the author. She was named Omakayas, or Little Frog, because her first step was a hop. Omakayas and her family live on an island in Lake Superior. Though there are growing numbers of white people encroaching on their land, life continues much as it always has. But the satisfying rhythms of their life are shattered when a visitor comes to their lodge one winter night, bringing with him an invisible enemy that will change things forever—but that will eventually lead Omakayas to discover her calling. By turns moving and humorous, this novel is a breathtaking tour de force by a gifted writer. The beloved and essential Birchbark House series by Louise Erdrich includes The Birchbark House, The Game of Silence, The Porcupine Year, Chickadee, and Makoons.