When he is in the Zoo he doesn't get anything so large as a deer, but rabbits and small things that he can swallow easily, and frogs, of which all snakes are very fond, perhaps because they are slimy and slip down quickly. There are many other snakes beside the boa, some not so large, but more poisonous. The boa is not poisonous. He relies on his huge strength to kill his enemies; but other snakes, such as vipers and rattlesnakes, are. Even when the head of a viper has been cut off it still remains poisonous, and may cause death. The rattlesnake is so called because it makes a funny rattle with its tail before it strikes. It is about five feet long sometimes, and the sound of its rattle sends terror into the heart of anyone who is near, as he knows that at any moment the snake may dart out upon him with its hideous head aloft and its wicked eyes gleaming. The rattlesnake is found in North America. The reptile house has been rebuilt and is very hot and damp, to suit the animals who live there. In the middle there is a large tank with numbers of ugly crocodiles living in it. They are dark greeny-brown, like a log that has been a long time in the water, and if you were floating down the Nile, or any river where crocodiles live, in a boat, and saw something floating that you thought a bit of old wood, it might very likely be the back or head of a crocodile. He has a bony coat like a suit of armour, and it would be very difficult indeed to break through it, and he swims along, using both his strong tail and his flat feet. He is what is called an amphibious animal, because he lives partly on land and partly in the water. He must breathe air, but he can shut up his nostrils by a fold of skin as we shut our eyes, and can remain under the water without breathing for some time. His enormous jaws are like a pair of great shears, and woe be to any animal or man who gets his leg between them. It will be cut off as cleanly as the gardener cuts a tall flower with his shears. The crocodile lives in water, and catches fish and other things; he comes out at times and lies on the banks, and in the evening, when the land animals come down to drink, he hides himself in the water, and catches anything he can with his ugly snout. Fancy a dainty antelope finding suddenly that his delicate nose was pinched tightly by Mr. Crocodile's teeth, and that he was being drawn down, down to a hideous death! But we have stayed much too long in the reptile house, and have not even mentioned the pretty little green frogs and the many other things to be found there.