What is meant by the term "mute" in relation to raptors?

The term "mute" in relation to raptors specifically refers to their excrement. This term is commonly used in avian contexts to describe the droppings produced by birds, including raptors. Mutes are often used as indicators of health and diet, as they can give insights into what a bird has been eating and its overall condition.

While the other options mention various aspects related to raptors, they do not specifically relate to the terminology used in birding and falconry. For instance, feces ejected with force might describe a behavior but does not encapsulate the proper terminology for droppings. Referring to an accipiter, a type of hawk, does not relate to the term "mute," and the ridge above the eye lacks a direct connection to the concept of a mute. The focus on the dropping itself is what makes "mute" a specific and accurate description in the context of raptor biology.