Land-dwelling animals that have taken to an aquatic mode of life have usually done so initially to escape land-dwelling predators. This is probably why the water ant has taken to building its huge nest on rafts in swamps and quiet backwaters. Each nest is made of twigs and fibrous vegetable material, waterproofed by a plaster of mud and bodily excretions. It is connected to the banks and to floating foodstores by a network of bridges and ramps. However, in their new mode of life the ants are still vulnerable to the swimming ant-eater, which has evolved in parallel with it. The ant-eater lives solely on the water ants, and to reach them undetected it attacks the nest from below, ripping through the waterproof shell with its clawed paddles. Since below the waterline the nest is made of discrete chambers that can rapidly be made watertight in an emergency, little damage is done to the colony as a whole. The ants drowned in an attack, however, are enough to feed the ant-eater.