Which of the following is NOT a characteristic of rats?

Rats are indeed known for their social behavior, often living in groups and exhibiting complex social structures. They also display neophobic tendencies, meaning they tend to be wary of new environments or unfamiliar objects, which is an instinctive survival trait. Additionally, rats are primarily nocturnal, being most active at night and seeking shelter during the day.

Given these characteristics, the assertion that rats are aggressive towards humans is misleading. While they can exhibit aggressive behavior in certain circumstances (such as when cornered or threatened), they generally prefer to avoid confrontation and will often flee from humans rather than attack. This behavior reflects their instinctual need for survival and self-preservation. Thus, the correct response identifies aggression towards humans as a characteristic that is not typically associated with rats in general context.