Humans have unique voices and can tell the difference between one person’s voice and another person’s voice (most of the time). Our friend next door sounds different from our teacher.
The Monk Parakeet is the first bird species known to have multiple vocalisations within its colony of individuals, reports New Scientist magazine in February 2023. Having different individual voices in the parakeet colony means that they can tell the difference between their friends and their enemies.
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