The hippopotami began to grunt, and plunged into the water, remaining there for some time, and then would come again to the surface, until gradually the navigation became dangerous, so much so that we had to be very careful, and paddle along the shore for fear of being upset by these huge creatures, who would surge from under the water in every direction, and we knew not where the next one would rise. Two or three times one rose very near my canoe. I did not want to fire at them, for they would have sunk to the bottom, and would not have risen for two or three days after, and then probably they would have been found at the mouth of the river, or been driven into the sea by the current. By the kind of groan or hoarse grunt they gave, I made up my mind that they were becoming enraged at having been disturbed, so we paddled carefully on until I thought we were at last out of their reach. But we were to receive a good fright before we had done with them, for I saw a canoe just ahead of the one in which I was seated rocking and jerking about in an extraordinary manner, and the people in it shouting at the top of their voices, and there came up a huge hippopotamus, which gave a terrific grunt, immediately responded to by the other hippopotami we had left behind. We paddled hard in order to get out of the way, for the huge creature seemed to be maddened; and at last, with a thankful heart, I left all the hippopotami behind, and, after some severe paddling, we reached a safe place on the bank of the river, where a general and grand cooking of the crabs began. CHAPTER XII. STRANGE SPIDERS.--THE HOUSE-SPIDER.--HOW THEY CAPTURE THEIR PREY.--HOW THEY FIGHT.--FIGHT BETWEEN A WASP AND A SPIDER.--THE SPIDER HAS ITS LEGS CUT OFF, AND IS CARRIED AWAY.--BURROW SPIDER WATCHING FOR ITS PREY. Now I must pause a little in that great jungle, and recount to you some of the queer things which I have seen among the spiders--the burrowing spiders, the house-spiders, the wall-spiders, and the spiders which weave their big and far-spreading webs among the trees of the forest or the tall grass of the open fields. I hope you will feel as interested as I did when you learn how smart many of them are. There are a very great variety of spiders in the country I have explored. Some are of queer shape. Each species has its peculiar habits. I often wish I had devoted more of my time to the study of their habits, and to ascertaining the way in which they catch their prey; but what I have observed I will relate to you. I will speak to you first of the house-spiders, and what I saw of them.