What does the term 'mute' refer to in relation to raptors?

The term 'mute' specifically refers to the excrement produced by raptors, which is a combination of feces and urates. This substance is unique to birds of prey and has particular characteristics that can help falconers and biologists assess the health and diet of the bird. Monitoring a raptor's mute can provide insights into what the bird is eating and even help gauge its hydration levels. Understanding the mute is crucial for maintaining proper care of raptors in falconry, as it can indicate whether the bird is digesting its food properly or if there are potential health issues.