I used to work at a University research institute. I had a contract to study the effects of birds being sucked into jet engines. Part of the study needed information on the weight of a bird, so I could correlate weight with engine damage. The agency with which I had a contract had another contract with a guy who identified bird types on the basis of the remains found in the engine. That way I could get bird weight once he identified the bird type.
My work was to estimate the probability of engine damage as a function of bird weight, time of day, season of year, etc. I analyzed hundreds of incidents and turned in a report. I don't know what, if anything, the agency did with it.
