All the thousand-and-one forms of insect life flew and crawled and swam and dived where the people of the rafts could see them. Water-beetles came lazily to the surface to snap at other insects on the surface. The shell-covered boats of caddis-flies floated in the eddies and backwaters.
The day wore on and the shores flowed by. The tribesmen ate of their food and drank of the river. When afternoon came the banks fell away and the current slackened. The shores became indefinite. The river merged itself into a vast swamp from which came a continual muttering.
The water seemed to grow dark when black mud took the place of the clay that had formed its bed. Then there appeared floating green things which did not move with the flowing water. They were the leaves of the water-lilies that managed to survive along with cabbages and a very few other plants in the midst of a fungus world. Twelve feet across, any one of the green leaves might have supported the whole of Burl's tribe.
They became so numerous that only a relatively narrow, uncovered stream flowed between tens of acres of the flat, floating leaves. Here and there colossal waxen blossoms could be seen. Three men could hide in those enormous flowers. They exhaled an almost overpowering fragrance into the air.
And presently the muttering sound that had been heard far away grew in volume to an intermittent deep-bass roar. It seemed to come from the banks on either side. It was the discordant croaking of frogs, eight feet in length, which lived and throve in this swamp. Presently the tribesfolk saw them: green giants sitting immobile upon the banks, only opening their huge mouths to croak.
Here in the swamps there was such luxuriance of insect life that a normal tribal hunting-ground--in which tribesmen were not yet accustomed to hunt--would seem like a desert by comparison. Myriads of little midges, no more than three or four inches across their wings, danced above the water. Butterflies flew low, seemingly enamoured of their reflections in the glassy water.
The people watched as if their eyes would become engorged by the strange new things they saw. Where the river split and split and divided again, there was nothing with which they were familiar. Mushrooms did not grow here. Moulds, yes. But there were cattails, with stalks like trees, towering thirty feet above the waterways.