| Recreation is as common among animals as it is among children (in Colours) | Frontispiece |
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| The Indians claim that the mother bison forced her calf to roll often in a puddle of red clay, so that it might be indistinguishable against its clay background | 6 |
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| The zebra is one of the cleverest of camouflagers. The black-and-white stripes of his body give the effect of sunlight passing through bushes | 7 |
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| Monkeys are the most musical of all animals. When they congregate for "concerts," as some of the tribes do, the air is filled with weird strains of monkey-music | 20 |
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| Cats, unlike dogs, are very fond of music. And it has been proved that their music-sense can be developed to a remarkable degree | 21 |
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| A happy family of polar bears. The young cubs wrestle and tumble, as playfully as two puppies. This play has much to do with their physical and mental development | 34 |
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| Dryptosaurus. The prehistoric animals, too, undoubtedly had their play time, with games and "setting up" exercises | 35 |
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| The mother opossum is never happier than when she has her little ones playing hide-and-seek over her back | 38 |
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| This young fox came from his home in the woods daily to play with a young fox-terrier. He is now resting after a romp | 39 |
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| Naosaurus and Dimetrodon, two extinct armour-bearers who should have been well able to protect themselves | 50 |
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| An armour-bearer of prehistoric times whose shield was an effective protection against enemy horns | 51 |
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| To the polar bear the ice and snow of the Far North means warmth and protection. The mother bear digs herself into a snowbank, where lives quite comfortably throughout the winter | 84 |
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| The sharp claws of the ground squirrel are efficacious tools in digging his cosy underground burrow | 85 |
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| The coyote can readily distinguish whether a herd of sheep is guarded by one or more dogs, and will plan his attack accordingly | 94 |
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| The zebu, the sacred bull of India, in spite of its domestication, has an agile body and a quick, alert mind | 95 |
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| Roosevelt's Colobus. These horse-tailed monkeys chatter together in a language exclusively their own, yet they seem to have no difficulty in making themselves understood by other monkey-tribes | 112 |
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| A tamed deer of Texas, whose constant companion and playmate was a rabbit dog. Between the two, there developed, necessarily, a common language | 113 |
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| Water-loving animals, like the beavers, seemingly take great pride in their toilets. Their fur is always sleek and clean | 122 |
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| Great forest pigs of Central Africa. Like the common domesticated hogs, they will seek a clay bath to heal their wounds | 123 |
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| The Rocky Mountain goat has many means of defence, not the least of which is his agility in climbing to inaccessible places | 134 |
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| Wild boars are among the most ferocious of animals. By means of their great strength alone they are well able to defend themselves | 135 |
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| Brontosaurus. The animals that seemed best equipped to defend themselves are the ones that, thousands of years ago, became extinct | 144 |
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| This prehistoric monster was equipped not only with a pair of strong horns but with a shield back of them as well | 145 |
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| The beaver is the greatest of all animal architects. His skill is equalled only by his patience (in Colours) | 158 |
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| The skunk mother tries to keep on hand a good supply of such delicacies as frogs and toads, so that her young may never go hungry | 172 |
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| The porcupine and the hedgehog have a unique method of collecting food for their young. After shaking down berries or grapes, they roll in them, then hurry home with the food attached to their quills | 173 |
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| The black bear is not one of the great migrating animals. The thickness of his coat must therefore change with the seasons | 188 |
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| Rabbits seem to have a well-devised system in their road-building, running their paths in and out of underbrush in a truly ingenious manner | 189 |
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| The mongoose, a scavenger of the worst type, feeding on rats and mice and snakes, and even poultry | 202 |
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| Diplodocus. The prehistoric animals, also, undoubtedly had their scavengers and criminals | 203 |
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| The Esquimo-dog is man's greatest friend in the Far North | 218 |
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| Chipmunks are among the most easily tamed of man's wild friends, and they even seem fond of human companionship | 219 |
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| Men cruelly take the lives of these denizens of the wildwood, rejoicing in their slaughter, but the animal soul they cannot kill | 244 |
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| Two pals. There is between man and dog a kinship of spirit that cannot be denied | 245 |
