A pellet or casting found under a raptor's perch is indicative of what?

Pellets or castings found underneath a raptor's perch are a normal part of the bird's digestive process. Raptors, which primarily feed on prey such as rodents and small birds, ingest bones, fur, feathers, and other indigestible parts of their meals. These materials cannot be broken down by the raptor's digestive system. Instead, the raptor forms them into a compact mass and expels it through the mouth, which is referred to as a pellet or casting.

Finding a pellet under a perch is significant as it provides insight into the raptor's dietary habits and the types of prey it has been consuming. This is a normal and healthy biological function rather than an indication of health issues or dysfunction. Therefore, recognizing the presence of these castings is essential for understanding the feeding behavior and health of the raptor.