Whale, Greenland Right 469 471 .. Whale, Killer 468 470 .. Whale, Sperm, or Cachalot 472 471 .. Whale, White, or Beluga 468 470 .. Whistler, or Hoary Marmot 536 535 .. Wildcat, Texan .. .. 612 Wolf, Arctic White 421 422 .. Wolf, Black .. 423 .. Wolf, Gray, or Timber 421 423 605 Wolf, Prairie 424 423 .. Wolf, Timber, or Gray 421 423 .. Wolverine 428 427 583 Woodchuck, Common 533 534 578 Woodrat 516 526 .. [Illustration: From a drawing by Louis Agassiz Fuertes Copyright by the National Geographic Magazine, 1916, Gilbert H. Grosvenor, Editor THE LARGEST CARNIVOROUS ANIMAL EXTANT THE ALASKA BROWN BEAR The great brown bear of the Alaska peninsula, _Ursus gyas_, and his cousin, _Ursus middendorffi_, of Kodiac Island, are the largest of all bears, as well as the largest carnivorous animals in the world. While sometimes attaining a weight of 1500 pounds, they are, as a rule, inoffensive giants, taking flight at the first sight of man. But when wounded, or surprised at close quarters, they give battle, and their enormous size, strength and activity render them terrific antagonists. The world did not know of the existence of these bears until 1898. During the spring the Alaska brown bear lives upon the salmon which come up the rivers and creeks to spawn, while in the summer and fall they eat the sedge of the lowland flats, grazing like cattle, and varying their diet with small mammals and berries which they find in the hills. The comparatively limited and easily accessible territory in which they live renders their future precarious unless reasonable means for their proper protection are continued.] The Larger North American Mammals BY E. W. NELSON _Chief, U. S. Biological Survey_ With Illustrations from Paintings by Louis Agassiz Fuertes At the time of its discovery and occupation by Europeans, North America and the bordering seas teemed with an almost incredible profusion of large mammalian life. The hordes of game animals which roamed the primeval forests and plains of this continent were the marvel of early explorers and have been equaled in historic times only in Africa.