{"fact":"Researchers trained crows to respond to the calls of specific individuals, demonstrating their ability to distinguish between different crow 'voices'.","context":"We next used an operant conditioning to verify the perceptual ability to discriminate non-breeding familiar conspecifics based on ka calls…Four of the five crows successfully transferred discrimination of individual calls to the novel ka calls.","source":"None Watanabe; None Izawa; None Kondo, Perceptual mechanism for vocal individual recognition in jungle crows (Corvus macrorhynchos): contact call signature and discrimination, 10.1163/000579510x505427","index":340}