{"fact":"Crows can remember faces – and hold a grudge! They can recognize people they perceive as unfriendly and warn others about them.","context":"They have demonstrated self-awareness in mirror tests and have tool-making ability. Crows can remember faces and warn each other when an unfriendly one approaches.","source":"Eman Oun; Heba Roshdy, Improved Crow Search Algorithm for Solving Quadratic Assignment Problem, 10.21608/esju.2023.215434.1014","index":504}