Here is another trick of theirs. They have been known to use traffic lights to open nuts and the like by dropping the nut on the crosswalk where car tires go, then waiting for a car to run it over, and they then further wait until there is a red light before going to fetch their cracked nut.
Here is a similar video of it (though this bird is using a regular intersection).
Couldn't find the vid i was thinking of though.
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