Only known animal communication I ever had documented is a bet with a friend on the Appalachian Trail South of Cosby Knob, Tn., abt. 1982
I bet him how much you wanna bet I can call in that raven on the farthest ridge across a valley that bird and ridge was visible to the two of us; his response, no way.
Fast forward to five to ten raven calls later we watched an abrupt change like airtraffic control had said,
" scoot here, fast".
Next five minutes, that raven was cocking his head over the two of us on the far ridge away from it, no words shared other than friends, wow!