Which of the following wasp species is generally considered non-aggressive?

The mud dauber wasp is generally considered non-aggressive compared to other wasp species. This is primarily due to its solitary nature and behavior. Mud daubers do not form large colonies like yellow jackets or bald-faced hornets, which often leads to more defensive behavior, especially when their nest is disturbed.

Mud daubers are more focused on hunting spiders to provision their nests rather than defending a territory or colony. Therefore, when encountered, they typically do not pose a threat to humans and will usually fly away rather than engage aggressively. Their nesting habits involve creating mud nests in sheltered areas, and as they are less social, their tendency to become aggressive in defense of those nests is significantly reduced.

In contrast, bald-faced hornets and yellow jackets are known for their aggressive nature, especially in late summer and fall when their food sources are scarce and they are more protective of their nests. Paper wasps can also defend their nests aggressively if threatened. Thus, the mud dauber's solitary and less aggressive behavior sets it apart as a more benign member of the wasp family.