Which technique is least likely to succeed in controlling muskrats?

Building higher dams is least likely to succeed in controlling muskrats because it does not address the underlying reasons for their presence. Muskrats are primarily attracted to water bodies for food and habitat. Simply increasing the height of dams may create more suitable habitats rather than deterring muskrats. In contrast, using traps can effectively target and reduce muskrat populations, while regular monitoring allows for the assessment of muskrat activity and effectiveness of control measures. Furthermore, solving habitat issues—such as managing vegetation or altering water levels—can deter muskrats by making the habitat less appealing. Therefore, while building higher dams might be an action taken, it does not directly engage with the species' needs and behaviors, making it the least effective technique in muskrat control.