If the defenders are so cunning, however, the attackers can sometimes turn the tables upon them. Animals that hunt often disguise themselves, in order to avoid the notice of the prey, and so steal unobserved upon their victims. Such tactics are like those of the Kaffirs, who cut bits of bush, and then creep up slowly, slowly behind them, under cover of the branches, upon the gnus or antelopes which they wish to slaughter. In No. 10 we have one example of this method of hunting or stalking, as pursued by the intelligent English grass-spider. All spiders, of course, have eight legs, four on each side; but in most of the class, the various pairs of legs are evenly distributed, so as to lie about the body in a rough circle or something like it. The grass-spider, however, has his own views on this important matter. His form and attitude are quite peculiar. He lies in wait for his prey on the open, crouched against a stem of grass, with his two front pairs of legs extended before him, and his back pair behind, in an arrangement which is rather linear than circular. This position makes him almost invisible--much more invisible in real life, indeed, than you see him in the drawing; for if he were represented as inconspicuous as he looks you would say there was no spider there at all, only a naked grass-stem. The delusion is heightened by his lines and colours: he is mostly green or greenish, with narrow black or brown stripes which run more or less up and down his body, instead of cross-wise as usual, so that they harmonize beautifully with the up-and-down lines of the blades and stem in the tuft which he inhabits. When he is pressed close against a bent of grass, on the look-out for flies, it is almost impossible for the quickest eye to distinguish him. Flies come near, never suspecting the presence of their hereditary foe; as soon as they are close to him, the grass-spider rushes out with a dash and secures them. His jaws are among the most terrible in all his terrible race: they are large and wide-spreading, with two rows of teeth on either side, and a pair of long fangs of truly formidable proportions. [Illustration: 10.--GRASS-SPIDER, IN AMBUSH FOR FLIES.] In other ways, also, this particular spider is a clever fellow, for he lives near water; but when the rains are heavy and there is likely to be a flood, he shifts his quarters higher up the ground, and so escapes impending inundation.