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There was a study as to why crows in Boston were subject to so many automotive accidents, it was getting to be a very large issue for those interested in nature conservation.
The strange part was that of all the accidents, the incidents were almost exclusively to do with trucks.
After a few weeks of studying the habits of Bostonian crows, the verdict came in that crows could "warn" each other of incoming traffic, but weren't reliable when it came to trucks, because all they could say was "Caw! Caw!"