Crows trained by people to attack others. Could be trained by military and/or police forces, much like k-9 units. Attack Crow units would have Badges as well. Other attack crows could be trained as a much more effective 24/7 personal bodyguard service. Adam Carolla came up with the idea once while ranting about the hateful nature of birds in general, suggesting we hone their readiness to "divebomb" people. Has led to many discussions on Loveline.
"See Drew, that's where my attack crows would come in, they just divebomb any a-hole that tries to mess with ya"