{"fact":"Crows can tell the difference between familiar and unfamiliar human and jackdaw voices, showing they recognize individuals across species.","context":"Furthermore, carrion crows have been shown to be able to differentiate between familiar and unfamiliar heterospecifics based on auditory cues... they responded more to familiar than to unfamiliar jackdaws vocalisa-tions (Wascher et al., 2012b).","source":"Claudia A.F. Wascher, Individual performance in socio-cognitive tasks predicts social behaviour in carrion crows, 10.1163/1568539x-00003245","index":166}