The North American PorcupinePraise for the first edition "Rarely does one encounter scientific writing that is at the same time authoritative, full of well documented data, and yet as readable as this book. It is good literature as well as good science. Readers almost feel as though they are looking over the shoulder of the observer, feeling his discomfort at the cold and rain, his excitement when something new and unexpected happens, and sharing in the sadness over the demise