My friend Ron called earlier to let me know that when he got back from some errands today, there were a couple dozen crows in his back yard, just hanging out in the trees and pecking at things in the yard. He tried cawing at them, and they didn't respond. When he played the calls of a raven, however, they anxiously flew off. But it wasn't long before they were back. What did they want?

I asked Ron if he'd looked back there to see what they might be after. Was there something dead they were scavenging? I told him to be careful, that he might find something unsavory. He promised to report back.

That was several hours ago. I haven't heard from him since...

A murder of crows.
What, or whom, do they wait for?
What else is back there?