A bigger fish comes, and eats the small fish. But the bigger fish also must look out for its own danger. Otherwise: The jaguar comes, and eats the bigger fish. But the jaguar also must look out for his own danger. Otherwise: The alligator comes, and eats the jaguar. But the alligator also must look out for his own danger. Otherwise: The hunter comes, and shoots the alligator. So you see that the animals that dwell in the jungle have to cultivate all their gifts to get on in life. CHAPTER XVI The Dog Tribe I have told you of several flesh-eating animals that are of the Cat Tribe. But there are some flesh-eating animals that are of the Dog Tribe. The most important one of these in the jungle is the _wolf_. How can you tell the difference between the Cat Tribe and the Dog Tribe? By the four qualities that the Cat Tribe has, and which the Dog Tribe does not have. I. The members of the Cat Tribe have four fangs. Those of the Dog Tribe do not have fangs. They have special teeth of their own kind. II. The members of the Cat Tribe have a rough tongue. Those of the Dog Tribe have a tongue which is not quite so rough. They do not need a very rough tongue, as they can scrape the meat from a bone with their teeth. III. The members of the Cat Tribe have retractile claws. The Dog Tribe's claws are rigid and stiff; that is, they are thrust out all the time. The members of the Dog Tribe do not use their claws in seizing or holding their prey; they hold the prey in their jaws. IV. All of the Cat Tribe have padded paws: they have them for many reasons, which I have mentioned on pages 71-72. But the paws of the Dog Tribe are not so thickly padded with muscles. The Dog Tribe do not need the thick padding of muscles, because: 1. They do not need to stalk their prey silently. They catch their prey by running it down, as a greyhound catches a hare. 2. They do not strike down their prey with their paws, but seize it in their jaws. 3. They do not need to give a _bound_ in catching their prey, so the muscles under their feet need not act like _springs_. The members of the Dog Tribe gain on their prey by moving their legs _quickly_, not by covering a large amount of ground with each movement of their legs. But the Cat Tribe do just the opposite: they do not move their legs so quickly, but they cover a larger amount of ground at each movement of their legs. As I have told you already, a dog _gallops_, but a cat _bounds_. The dog's legs move much faster than the cat's, but the cat gives a bigger jump than the dog each time. _The American Gray Wolf_ I have said that the most important wild animal of the Dog Tribe is the wolf. Wolves are found in every continent--Europe, America, Asia, and Africa. And there are many species of wolves in these continents. I shall tell you more about them in another book, but now I must tell you about the American gray wolf.