Wolves are almost always followed by ravens - waiting to scavenge from the next kill. Typically, between 5 and 20 ravens attend a kill site. Each raven can eat or cache about two pounds of food per day.
Ultimately, ravens can scavenge as much as a third of what wolves kill. Perhaps wolves live in groups to reduce losses to scavenging ravens. Larger packs, despite the cost of sharing with more pack mates, might do better than smaller packs by minimizing losses to scavenging ravens.

When you catch something big, you must be prepared to deal with scavengers. Some species, like cougars, lions, and cheetahs hide the carcasses of their prey or cache them out of reach from scavengers