Supplementing the work of Mr. Nelson and Mr. Fuertes is a series of drawings by the noted naturalist and nature-lover, Ernest Thompson Seton, showing the tracks of many of the most widely known mammals. “Wild Animals of North America” provides in compact and permanent form a natural history for which the National Geographic Society expended $100,000 in the two issues of the Magazine in which the articles and illustrations originally appeared. GILBERT GROSVENOR, _Director and Editor_. INDEX TO WILD ANIMALS OF NORTH AMERICA (The articles and illustrations in this volume are reproduced from the November 1916, and May, 1918, National Geographic Magazine. The first page is numbered 385, as it originally appeared in the Magazine The following pages are numbered in sequence.) Color Track Text illustration illustration Antelope, Prong-horn 452 451 611 Armadillo, Nine-banded 584 559 .. Badger 420 419 601 Bat, Big-eared desert 603 567 .. Bat, Hoary 598 566 .. Bat, Mexican 599 567 .. Bat, Red 596 566 .. Bear, Alaskan Brown (frontispiece) 441 .. .. Bear, Black 437 439 608 Bear, Cinnamon, or Black 437 439 .. Bear, Glacier 437 439 .. Bear, Grizzly 440 442 608 Bear, Polar 436 438 .. Beaver, American 441 443 .. Beaver, Mountain 529 534 .. Beluga, or White Whale 468 470 .. Bison, American, or Buffalo 461 463 .. Blarina 593 566 595 Bobcat, or Bay Lynx 409 411 .. Bowhead 469 471 .. Buffalo, or American Bison 461 463 .. Cachalot, or Sperm Whale 472 471 .. Caribou, Barren Ground 460 422 610 Caribou, Peary 460 422 .. Caribou, Woodland 460 459 .. Cat, Common .. .. 487 Cat, Jaguarundi, or Eyra 413 415 .. Cat, Ring-tailed 586 562 .. Chipmunk, Antelope 545 539 ..