1. Catch up with each other. When the current is quite turbulent, the whole ant colony will surround the queen ant in the middle, then form a big ball, and then drift with the current to form the outermost layer, that is, the "spherical skin" ants will be drowned by the water, but more middle ants will survive.
2. Ants cross the river on the bridge through connectors on both sides of the river, such as "bridge";
3. Use floating objects with some objects, such as leaves, branches and other floating objects;