There is one more lizard which I have seen next door to the crocodile tank at the Zoo: a very curious little animal, almost of the same colour as the stick along which it walks, so slowly and silently that you may stand and watch it for some time without being sure that it is moving at all; though its eyes, which can move in different directions at the same moment, and its long thin tongue, so clever at catching the insects on which it feeds, are constantly in motion; but for its eyes and tongue, the Chameleon looks as if it were as dead as the withered branch to which it clings. The name of this lizard means "Ground-lion," but it is very unlike the king of beasts both in appearance and disposition. The chameleon is found in Spain, in Sicily, and in Syria; its home is in the branches of trees. Many stories used to be told of the way in which it would change colour, not exactly by blushing like a human creature, but by becoming green, yellow, and even black when angry or calm, or when in sunshine or shade; but naturalists who have kept a careful watch upon it do not believe that all that has been said about this is true. There seems to be no doubt, however, that it changes its colour according to its surroundings--a means of protection given to a creature otherwise very defenceless. [Illustration: "A lizard's body, lean and long, A fish's head, a serpent's tongue."] Serpents--so called from a word which means that which _creeps_--are constantly used in the Bible as emblems of deceit and treachery. The words, "More subtle than any beast of the field," may well come to our minds as we watch a serpent, with its limbless body, winding along with that soft, gliding motion to which we have given the name "snake-like." In the serpent's eyes, too, though they are often so beautiful that we cannot but admire them, there is some of this same dangerous subtlety--an untrust--worthiness which makes us shrink from looking at them.