Here's why it might seem that way:
* Nutritional value: The head of a salmon is rich in fat and protein. Wolves are opportunistic feeders and will prioritize the most nutrient-dense parts of their prey.
* Access: The salmon's head is often the easiest part to access, particularly when the fish is still fresh and the carcass hasn't been scavenged.
* Competition: Wolves are social animals, and they may compete for food. If a pack is scavenging a salmon carcass, they might fight over the head, giving the impression that it's the only part they eat.
However, wolves will eat the entire salmon if they have the opportunity. They will eat the flesh, organs, skin, and even the bones. They are incredibly efficient predators, and they don't waste any edible parts of their prey.