I'm sorry - yes you ARE in the predators thread. I have no idea where I thought I was. If that makes sense. Two sets of prints could mean A mama and baby she is training to hunt.
Is there a trail of feathers to follow? Or any sign left by a predator, some fur maybe or pawprints on the ground. Are the wounds similar on the dead ones?
You may want to have this moved to the predator threads. They could offer better advice than me. There is a chance though that your other birds survived and panicked, either flew away or are hiding. Try putting feed out for them to see if they can be coaxed back. Have your walked your...