Researchers found that crows can control the number of vocalizations they produce, 'counting' up to four in response to cues, showing understanding of numerical quantities.
The ability to count out loud, like human toddlers, requires purposeful vocal control and a grasp of symbolic counting, a developmental skill.
Crows trained to produce 1-4 vocalizations in response to cues exhibited deliberate control, planning the number of vocalizations before starting.
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