{"fact":"American crows can remember threatening human faces, or masks, for at least 2.7 years, demonstrating an impressive long-term memory for social interactions with other species.","context":"American crows caught and released by humans wearing a unique mask scolded any human wearing the mask for up to at least 2.7 years after the initial catching event.","source":"Alex H. Taylor, Corvid cognition, 10.1002/wcs.1286","index":278}