Naked mole-rats live in large underground colonies where vision has limited value and social coordination matters. Researchers cataloguing their sounds have identified more than twenty-five vocalization types, used across encounters involving contact, alarm, aggression, mating, pups, and other situations.

One frequently studied chirp also carries information about colony membership. Acoustic patterns differed among colonies, and pups developed the local pattern around them. Changes in colony leadership were associated with changes in vocal patterns, suggesting that social structure helps maintain the shared sound. A mole-rat entering a tunnel therefore encounters not just calls, but calls with a recognizable group signature.

This is a rich communication system, but the evidence does not establish human-like language. Researchers can connect sounds with contexts and group differences without claiming grammar, unlimited meaning, or conversation in the human sense. The established surprise is already substantial: beneath the soil, a nearly blind mammal belongs to a colony you can hear in its chirp.