There are also videos on youtube of crows that learned to wait for the walk signal to walk into a crosswalk to drop off a hard nut shell that car tires then crush and they then walk back out to pick up the now exposed food.
I've seen crows do this on my own neighborhood, both on side streets with little traffic, and on main streets on the crosswalk. I had heard of crows doing this in Japan but was impressed to see this in central Europe (although it's corvus cornix, the grey-black kind, not the full black one)
