ScienceDaily (Apr. 19, 2012) — In daily life we remember faces and voices of several known individuals. Similarly, mammals have been shown to remember calls and faces of known individuals after a number of years. Markus Boeckle and Thomas Bugnyar from the Department of Cognitive Biology of the University of Vienna show in their recent article, published in Current Biology, that ravens differentiate individuals based on familiarity.
Read the rest here. Very informative study.
Awesome, thanks. I'll pass that along.
But how do they know if they remember the call, or just responding in a predictable way to the sound of the call at that particular moment?