Which raptor is least likely to nest on a cliff?

The jack, or jackrabbits, are not raptors and do not engage in nesting behaviors at all, as they are mammals. In the context of this question, when discussing raptors, it's essential to focus on species known for their specific nesting behaviors.

Golden eagles and prairie falcons are well-documented for their preference for cliff nesting. These species often select elevated ledges that provide safety from predators and a strategic vantage point for hunting. The nesting habits of jerkin, which refers to a type of kestrel, also align with the general behaviors of raptors that prefer open areas and trees rather than cliffs.

In summary, the least likely to nest on a cliff is the jack, as it does not belong to the raptor category and therefore cannot exhibit any nesting behavior characteristic of birds of prey.