{"fact":"Crows can tell the difference between a predator that continues to approach after they've started escaping and one that stops, adjusting their escape behavior accordingly.","context":"Corvids can easily differentiate between a predator (in this case, a human observer) that pursues (approach type “chase”) and one that immediately stops approaching when the bird initiates escape (approach type ”halt”), by increasing time spent escaping, by making larger adjustments in escape trajectory, and by more frequently changing from terrestrial to aerial escape strategy.","source":"Kunter Tätte; Anders Pape Møller; Raivo Mänd, Corvids exhibit dynamic risk assessment during escape, 10.1016/j.beproc.2019.104017","index":622}