"Because he thought it best, Bessie. He made everything in the way which best fitted it for the purpose for which he intended it. This little crab lives under the sea, where he has a great many enemies, and where he has to find his food. With these round, staring eyes which stand out so far from his head, he can look in every direction and see if any danger is near, or if there is anything which may do for him to eat. With these long, awkward legs, he can scamper out of the way, and with those sharp claws, he fights, for he is a quarrelsome little fellow. He can give a good pinch with them, and you had better not put your fingers too near them. Under that hard, black shell, he has a tender body, which would be hurt by the rocks and stones among which he lives, if he had not something to protect it."