The root of the wolf-raven relationship stems from the same connection shared between all predators and scavengers. Predators catch prey, take their fill, pass it along to less dominant members of the group, and when everyone's done, scavengers dive in and take their share of what's left.
… The relationship between wolf and raven isn't defined by an antagonistic fight over flesh. In reality, their relationship is mutually beneficial to the point of being allies, even friends. As the Adirondack Wildlife Refuge notes, ravens are hyper-vigilant at kill sites, and act as sentries for wolves to protect against incoming threats. Ravens even alert wolves to nearby prey, and wolves react to raven vocalizations in turn. Wolves even have been seen visually following ravens in flight. And in a truly stunning case of give-and-take, if a carcass is too tough for ravens to peck their way through themselves, they will more or less gift the carcass to wolves by finding and leading them to it.
If this sounds unbelievable, well, the relationship doesn't stop there. Wolves and ravens also engage in play when not seeking and collaborating over food. Ravens dive in for a bit of mischief and pull at wolves' tails, and wolves have been observed chasing them around, too. Ravens and puppies even play tug-of-war with sticks, with ravens flying overhead and poking the puppies with sticks to provoke them. There's even evidence that singular ravens and wolves develop individual relationships.
… Much of this interactivity likely stems from, as stated, each species' uniquely high combination of sociability and intelligence. Even so, the wolf-raven relationship stands out as one of the most notable, in-depth, and symbiotic in nature.