This book presents the annual report of the United States Biological Survey, an organization dedicated to the study of wildlife, both harmful and beneficial, and the implementation of conservation efforts. Covering a broad range of issues, the report begins with observations about the negative impact of bacterial disease on eelgrass, a vital food source for wildlife, and the subsequent decline in waterfowl populations. The report then examines methods in use by the organization to control invasive species, conduct wildlife disease research, and protect migratory bird populations through the establishment of sanctuaries. Finally, the report investigates the latest methods for the conservation of fur-bearing animals, including nutritional research and breeding experiments. The report demonstrates the broad range of efforts undertaken by the organization, encompassing both scientific research and practical implementation, in its mission to protect and preserve wildlife populations.