{"fact":"Crows can learn to control their vocalizations, choosing when to call and when to stay silent, much like humans do with speech.","context":"Here, we show that crows, songbirds of the corvid family, can be trained to exert control over their vocalizations. In a detection task, three male carrion crows rapidly learned to emit vocalizations in response to a visual cue with no inherent meaning (go trials) and to withhold vocalizations in response to another cue (catch trials).","source":"Katharina F. Brecht; Steffen R. Hage; Natalja Gavrilov; Andreas Nieder, Volitional control of vocalizations in corvid songbirds, 10.1371/journal.pbio.3000375","index":206}