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A team of scientists has shown that crows can 'count' out loud – producing a specific and deliberate number of caws in response to visual and auditory cues. While other animals such as"Whether this capacity exists in animals other than humans is yet unknown. We show that crows can flexibly produce variable numbers of one to four vocalizations in response to arbitrary cues associated with numerical values.
All three crows, the researchers found, were able to produce the correct number of caws in response to the cues, with the occasional error mostly presenting as one caw too many or too few. Interestingly, the timing and sound of the first vocalization in a sequence were linked to how many vocalizations were made subsequently, and each vocalization in a sequence had acoustic features specific to its place in that sequence.
It could indicate a previously unknown channel for avian communication in the wild. Chickadees, for instance, produce a greater number of"dee" sounds in their alarm calls for larger predators.
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