Many raptors will methodically and deliberately remove the intestinal tract of their prey before consuming it, a behavior that I've photographed several times with different species.

Do hawks eat carcasses?

Red-tailed hawks, ferruginous hawks, northern goshawks, and golden eagles hunt these bigger mammals. Carrion: Dead animals and rotting carcasses are the primary diet of scavenging raptors such as the turkey vulture and the California condor.

What animal would leaves entrails?

Foxes and cats will both leave entrails behind.