Which of the following raptors does not fit with the others?

The choice of "Musket" as the one that does not fit with the others is based on the nomenclature used for male raptors in falconry. The terms "Jack," "Jerkin," and "Tiercel" all refer specifically to male birds of certain species within the raptor family. For instance, "Jack" is often associated with male kestrels, "Jerkin" refers to male sparrow hawks, and "Tiercel" is a term that denotes male falcons, derived from the French word for third, indicating that a male falcon is usually one-third smaller than a female.

On the other hand, "Musket" is not commonly used to describe a male raptor; instead, it is sometimes a less specific term. In falconry, "Musket" may refer to a variant of other nomenclatures but does not have the same widely accepted and specific usage pertaining to male raptors as the other terms do. Therefore, "Musket" stands out as the odd one, primarily because it lacks the clear identity as a term strictly associated with male birds in falconry compared to the other options.