Ants can accidentally start walking in circles which can kill the whole colony

The “ant death spiral” is a phenomenon noted seemingly only in army ants, which unlike other kinds of ants do not make permanent nests and are always on the move while they’re alive. There are over 200 varieties of army ants, and apparently this type is blind, and depend on smells to navigate. Typically they follow the scent-trails of the ants before them in the swarm. The death-spiral is an example of what happens when the swarm as a whole gets misdirected — and a convenient metaphor illustrating the perils of follow-the-leader behavior in any society.