Crows trained by individuals strike other people. Could be trained by military and/or police causes, similar to k-9 units. Attack Crow devices would have Badges besides. Other attack crows could possibly be trained as a much more efficient 24/7 personal bodyguard service. Adam Carolla developed the theory when while ranting towards hateful nature of wild birds as a whole, suggesting we hone their preparedness to "divebomb" people. Has led to numerous talks on Loveline.