I've watched karasu carefully wait for a yellow light to drop his walnut in an intersection. The last car passing cracked his nut, then he had time to gather the meat during the light change before other cars came along.
Some crows in Japan do something like that, dropping nuts on/near a pedestrian crossing, and waiting for a green pedestrian light. See https://youtu.be/BGPGknpq3e0?feature=shared
