{"fact":"Crows don't just respond to the calls of their own kind! They can tell the difference between familiar and unfamiliar human and jackdaw voices.","context":"In the present study, we investigated whether carrion crows (Corvus corone corone) could discriminate between voices and calls of familiar and unfamiliar individuals of two heterospecific species, humans, and jackdaws (Corvus monedula).","source":"Claudia A. F. Wascher; Georgine Szipl; Markus Boeckle; Anna Wilkinson, You sound familiar: carrion crows can differentiate between the calls of known and unknown heterospecifics, 10.1007/s10071-012-0508-8","index":329}