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Even in a crowd, individuals remain unique, rodent vocalization study finds
Paradoxically, being part of a crowd is what makes you unique, life scientists report. Researchers examined the evolution of individuality -- personal uniqueness -- by recording alarm-call vocalizations in eight species of rodents that live in social groups of various sizes. They found that the size of the groups strongly predicted the individual uniqueness in the animals' voices: The bigger the group, the more unique each animal's voice typically was and the easier it was to tell individuals apart.
Source: ScienceDaily