Here's why:
* Commensalism is a symbiotic relationship where one organism benefits, while the other is neither harmed nor helped.
In this case:
* The grizzly bear benefits: It gets a nutritious meal from the salmon.
* The birds and small mammals benefit: They get a readily available food source, which they wouldn't otherwise have access to.
* The grizzly bear is neither helped nor harmed: The bear's actions don't directly impact its own well-being in this scenario.
It's important to note that while the bear doesn't directly benefit from the scavengers, the relationship can be considered indirectly beneficial. The presence of scavengers helps reduce the risk of disease spreading from the carcasses, which could potentially harm the bear.