I agree. It should include birds of prey, but in my case, I knew it wasn't. I had to put down one of my cats who had been mauled my a great horned owl, and my duck didn't have the claw marks on her back.
In the search to find out what killed my duck, I came across this page: http://icwdm.org/Inspection/livestock.asp I though others might find it helpful.
Damage Identification General Principles
HELP US!
We would like to expand our information. Send your suggestions to I Will Help
Predation is...