Like people in bear costumes

I was taking out the trash, and there was some hawk-like bird--I say 'hawk-like' because it was bigger and had a hard, curled beak--killing a pigeon. At first I thought they were mating, but it seemed to go on too long compared to other bird matings I've witnessed. Can hawks mate with pigeons anyway? The 'hawk' was holding this pigeon down with its talons, and the pigeon was fluttering its wings as much as it could. I thought I should stop things, considered throwing a rock. What kind of imposition would that be? Also, would the hawk attack me. It made me think of the movie Dan and I saw the other day, Grizzly Man. The Grizzly Man preys for rain so the bears in Alaska can eat. Then the bears eat him (and his girlfriend).

Took the trash to the dumpster, and when I came back the pigeon was dead. The 'hawk' was plucking feathers from its head. There were feathers everywhere.

There are also dead locusts--not their shells, but whole bodies--upturned, sometimes being eaten by ants. I was collecting them, at first, because they seemed special: remains intact. Then I realized how many there were, and today I found one dying. I think they die when they get stuck on their backs, a possibility I had considered but dismissed because cockroaches can flip themselves over. Though turtles can't...

Anyway, I turned the locust right, and it wasn't there on the walk home, so I'm hoping it survived. I saved one of thing, at least.


Edit:
Wait, found this,
"A locust placed upside down on a flat surface uses a predictable sequence of leg movements to right itself. To analyse this behaviour, we made use of a naturally occurring state of quiescence (thanatosis) to position locusts in a standardised upside-down position from which they spontaneously right themselves."

So I'm not sure what's going on.
Found at, http://jeb.biologists.org/cgi/content/abstract/204/4/637