{"fact":"Surprisingly, whether a human approaching a crow was smiling or scowling didn't seem to affect the crow's flight initiation distance.","context":"Facial expression had no effect on FID. Crows did not flee sooner when approached by a scowling (n = 22) vs. smiling (n = 24) human, either when gaze was direct or averted.","source":"Barbara Clucas; John M. Marzluff; David Mackovjak; Ila Palmquist, Do <scp>A</scp>merican Crows Pay Attention to Human Gaze and Facial Expressions?, 10.1111/eth.12064","index":54}