These two volumes provide scientifically accurate information about all the world's mammals, even the most obscure. There are black and white photographs of almost every species, although some of the images are not good quality. Generally the information on each animal covers where it is found, what it eats, social habits, information on mating and rearing young, and a detailed description of size, shape, weight, color, and other physical attributes. The writing is dry and uses a lot of scientific terms. There are extensive bibliographies of the scientific papers used to verify the accuracy of the information; this book is considered one of the best of its kind by scientists who study and work with mammals.