Back to the den came Vix, and carried the chuck so carefully that he was able to struggle a little when she got there. A low 'woof' at the den brought the little fellows out like schoolboys to play. She threw the wounded animal to them and they set on him like four little furies, uttering little growls and biting little bites with all the strength of their baby jaws, but the woodchuck fought for his life and beating them off slowly hobbled to the shelter of a thicket. The little ones pursued like a pack of hounds and dragged at his tail and flanks, but could not hold him back. So Vixen overtook him with a couple of bounds and dragged him again into the open for the children to worry. Again and again this rough sport went on till one of the little ones was badly bitten, and his squeal of pain roused Vix to end the woodchuck's misery and serve him up at once. Not far from the den was a hollow overgrown with coarse grass, the playground of a colony of field-mice. The earliest lesson in woodcraft that the little ones took, away from the den, was in this hollow. Here they had their first course of mice, the easiest of all game. In teaching, the main thing was example, aided by a deep-set instinct. The old fox, also, had one or two signs meaning "lie still and watch," "come, do as I do," and so on, that were much used. So the merry lot went to this hollow one calm evening and Mother Fox made them lie still in the grass. Presently a faint squeak showed that the game was astir. Vix rose up and went on tiptoe into the grass--not crouching but as high as she could stand, sometimes on her hind legs so as to get a better view. The runs that the mice follow are hidden under the grass tangle, and the only way to know the whereabouts of a mouse is by seeing the slight shaking of the grass, which is the reason why mice are hunted only on calm days. And the trick is to locate the mouse and seize him first and see him afterward. Vix soon made a spring, and in the middle of the bunch of dead grass that she grabbed was a field-mouse squeaking his last squeak. He was soon gobbled, and the four awkward little foxes tried to do the same as their mother, and when at length the eldest for the first time in his life caught game, he quivered with excitement and ground his pearly little milk-teeth into the mouse with a rush of inborn savageness that must have surprised even himself.