{"fact":"Within a group of observed crows, a unique \"oui\" call was observed exclusively in the context of what researchers believe was a planned aggressive attack.","context":"Finally, red emitted five “oui”, calls that we had never encountered in any other context within the investigated five recordings nor during other behavioural tests or daily husbandry…These calls were accompanied by a threatening gesture of raised crown and mantle feathers and the beak pointed down.","source":"Benedikt Holtmann; Julia Buskas; Matthew Steele; Kristaps Sokolovskis; Jochen B. W. Wolf, Dominance relationships and coalitionary aggression against conspecifics in female carrion crows, 10.1038/s41598-019-52177-7","index":114}