What Does “A Colony of Rats” Mean?
“Colony” describes rat groups accurately, pointing to real, well-documented social organization rather than just a loose gathering. Rats, particularly the widespread Norway rat, live in structured colonies with clear social hierarchies, established and maintained through both cooperative behavior and occasional dominance displays among colony members.
Much of what’s known about rat social behavior comes from extensive laboratory research, since rats are among the most heavily studied mammals in behavioral science, research that’s revealed genuinely surprising social sophistication, including documented cases of rats showing what researchers describe as empathetic behavior, such as working to free a trapped companion even without any direct reward for doing so. Wild rat colonies build extensive burrow systems similar in complexity to rabbit warrens, with separate areas for nesting, food storage, and waste, supporting populations that can grow substantially wherever food and shelter are reliably available.
Example: “A colony of rats had established itself beneath the old barn, its tunnel network more extensive than anyone realized.”
Related: Collective Nouns for Mammals · What Is a Group of Rats Called?