While grazing, a buffalo stirs up insects. These insects are eaten by cattle egrets. What type of interaction does the cattle egret exhibit with the buffalo?

The interaction the cattle egret exhibits with the buffalo is commensalism.

Explanation:

In the type of interaction called commensalism between two organisms, one organism benefits from the other while the other organism is neither benefited nor harmed.

When the buffalo moves around a field grazing it disturbs the insects and they fly away from the buffalo and the cattle egret which keeps following the grazing buffalo eats the insects.

The buffalo doesn't benefit from this type of interaction. A commensalism relation is a positive-neutral kind of relation.