Fox squirrels of the Midwestern United States scatterhoard nuts especially in anticipation of cold and snowy winters.A c......

为了解松鼠取食核桃的规律以及松鼠危害核桃所造成的损失,采用全事件记录法收集松鼠取食核桃数据并对200核桃种植户进行了访查。结......