{"fact":"Even when their vision is blocked, crows can still figure out roughly where food is, but they struggle to guide their tools precisely.","context":"These results indicate that movement trajectories were different between target positions irrespective of visual condition but that vision blocking had different effects on trajectory under far and near conditions.","source":"Masaki Kanai; Hiroshi Matsui; Shigeru Watanabe; Ei-Ichi Izawa, Involvement of vision in tool use in crow, 10.1097/wnr.0000000000000229","index":62}