Which of the following is NOT a method of controlling rats?

In the context of controlling rat populations, the option referring to increased nesting sites is not a method of control. In fact, increasing nesting sites would likely exacerbate the problem, as it provides more opportunities for rats to thrive and reproduce. Effective control methods focus on reducing the rat population and eliminating their habitats or resources that support their presence.

Baiting and trapping are established methods used to directly reduce the number of rats. Baiting involves using poison or traps laced with food substances that attract rats, leading to their consumption of the bait and ultimately decreasing their numbers. Environmental modifications include practices such as removing food sources, sealing entry points, and reducing clutter, which diminish the conditions necessary for rats to live and reproduce.

By contrast, increasing nesting sites goes against the goal of pest control, which aims to minimize environments that encourage population growth. Thus, recognizing the elements that support the survival of pests is critical for effective rat management strategies.